RHYTHMER OSfor MPC SAMPLE
FIRST GROOVEMANUAL

FIELD GUIDE / 0.4.0-BETA.3

Less guessing.
More groove.

A hands-on manual for RHYTHMER OS for MPC Sample.

WATCH THE FILM / FOLLOW AT YOUR OWN PACEYour first groove
with RHYTHMER OS.
From a drum kit to a four-bar groove. Watch, then build drums, bass, chords, acid and a chopped break with the step-by-step guide.
25 CHAPTERS + 2 VISUAL GUIDESUPDATED 16 NOV 2026BETA.3 EDITION

Adapted from the Melodee user guide by Kerem Kiliç (Ellic Studio), with RHYTHMER-specific instructions by jazzy rhythmer. Full credits ↘

RHYTHMER OS / FOR MPC SAMPLE01 / KEEP CLOSE

THE CONTROLS YOU NEED FIRST

Know these.
Keep the groove.

Push means click. Turn means rotate. Read the screen’s current B1–B3 labels.

01

GO BACK

SHIFT+ENCODER PUSH ↓

Return to the previous page. In a confirmation, cancel. GEN subpages return to GEN first.

02

OPEN TRACKS

PAD FX+KNOB FX

Press together. Select a track; Push opens its sound. B1 TRACK SETUP changes its instrument or type.

03

SELECT A TRACK

PAD BANK+PAD 1–16

Hold PAD BANK, tap the track pad, then release. Check the track number in the header.

04

OPEN THE SOUND

SAMPLE

Stage is the selected track’s sound home. Return here from PATTERNS to play the instrument.

05

OPEN PATTERNS

SEQ

Choose or launch patterns. Pads select patterns here; SAMPLE returns to playing sounds.

06

SAVE THE PROJECT

SHIFT+PAD 16→B1 SAVE

Save tracks, patterns and arrangement. User Sound / User Kit presets are saved separately.

07

FINE-EDIT A VALUE

SHIFT+ENCODER TURN ↻

Fine-adjust the last knob you touched. On Stage EDIT, turn K1–K3 first to choose the parameter.

08

GENERATE AN IDEA

SHIFT+B3 GEN

From SEQ → PATTERNS. Read the target tracks and NEW SOUNDS / KEEP SOUNDS before applying.

RECORDSEQ RECORD → PLAY
SAMPLE first to play notes.
UNDO / REDOSHIFT + − / +
For supported project edits.
CUT STUCK AUDIOSTOP twice, within 400 ms.
SHIFT + STOP sends All Notes Off.

NOTE REPEAT / ARP can temporarily replace soft-key labels with repeat rates. Turn it off to restore those menus. In a modal dialog, finish or cancel the dialog first.

OPEN THE ONE-PAGE REFERENCE ↗
RHYTHMER OS / FOR MPC SAMPLE02 / THE BIG PICTURE

ONE PROJECT. CONNECTED IDEAS.

A place for sound.
A path to a song.

PROJECTYour whole session.Tempo · key / scale · 16 tracks · scenes · arrangement
↓ CHOOSE ONE OF 16 TRACKS
TRACKSound + patterns + mix
01020304050607080910111213141516
↓ GIVE IT A ROLE · EMPTY OFFERS THREE CHOICES
PLUG-IN

One instrument.

Synth or percussion voice: one sound, played across notes. Choose its preset; shape it in EDIT.

Rhythmer Kit is a plug-in.
16 independent pad sounds, with whole-kit presets and per-pad source editing.
KIT

Your samples.

Native Sample Kit. Load audio onto pads or import an MPC kit. Trim, chop, tune and shape each pad.

Break starts with a loop.
Load your audio, set 1–4 bars, generate chops and perform in BRK PERF.
MIDI

Other gear.

Notes and controls for an external instrument. Choose its port and channel; arrange its part here.

Audio stays external.
A MIDI track does not make sound on its own.
↓ NOTES LIVE IN PATTERNS · UP TO 128 PER TRACK
PATTERNSBuild each part
→
SCENESLaunch parts together
→
SONGArrange / export
SHAPE THE IDEA

PRESETS → EDIT

Choose the sound, then change it. PERFORM is for hands-on effects. GEN writes ideas; Acid / Break expose their own operations.

HEAR THE WHOLE

TRACKS → MIX

Balance track levels, sends A–D and effects. Engine effects, track inserts and bus effects are separate stages.

PROJECT SAVEThe session: tracks, patterns and arrangement.
USER SOUND / USER KITA reusable instrument or kit preset. Keep source audio too.

Selecting a track chooses the part you work on. SAMPLE opens its sound. SEQ opens its patterns. TRACK SETUP changes its role; DELETE TRACK is a separate confirmed action.

OPEN THE ONE-PAGE OS MAP ↗

01 / START HERE

Start with a track.

READ THIS FIRST / TRACK BASICS

Select a track. Open its sound. Change what it plays.

  1. SELECTHold PAD BANK, tap the numbered pad for track 1–16, then release PAD BANK. Check the track number and instrument in the header.
  2. OPENTap SAMPLE to open that track’s Stage, its sound home. Or press PAD FX + KNOB FX together for TRACKS, select the track and Push the encoder.
  3. LOAD OR CHANGEOn an EMPTY track, turn the encoder to a PLUG-IN / KIT / MIDI card and Push. For an assigned track, use TRACKS → B1 TRACK SETUP; choose CHANGE PLUG-IN or TRACK TYPE.
  4. PLAY & SAVEPlay sounds on Stage. Use SEQ → PATTERNS to choose patterns; return with SAMPLE before playing a part. Save with SHIFT + Pad 16 → B1 SAVE.

Track selection is not a page change. Selecting a track while on PATTERNS keeps that working page. Tap SAMPLE to open its sound. In a track-owned preset/load browser, changing tracks closes the old browser and opens the new track’s Stage.

Change a track type, step by step ↓ · Cancel, undo or get back ↓ · Save a sound or kit ↓

Make a beat, choose a sound and save an idea. You do not need to learn every engine before you start.

GUIDED FIRST SESSION / WATCH 2:51 / FOLLOW AT YOUR OWN PACEYour first groove with RHYTHMER OS. Four bars at 140 BPM: drums, bass, FM-106 pad chords, acid and Think break. Shape the sound, mix the tracks and perform a mute jam.

Then follow the chapter that matches what you want to do next:

RHYTHMER OS for MPC Sample startup screen
Startup · RHYTHMER OS for MPC Sample

02 / START HERE

A project, at a glance.

RHYTHMER OS for MPC Sample builds on Melodee’s groovebox foundation. A project combines up to 16 tracks, independent patterns, scenes, a song timeline, mixing and effects. The added engines, Rhythmer Kit, GEN tools and Break performance pages sit inside that environment.

ObjectWhat it holds
TrackOne Sample Kit, one Rhythmer Kit / plug-in instrument, or one external MIDI part.
PatternNotes and recorded knob movements for one track. Each track has 128 pattern slots in banks A–H.
SceneThe corresponding pattern slot across tracks; useful for changing a whole section.
SongClips of track patterns arranged on a timeline.
MixerTrack levels/pans, four send buses A–D, and master processing.
LooperFour tempo-following audio loops, L1–L4.

Four track choices. Different jobs.

ChooseUse it for
Sample KitLoad and chop your own samples, or import supported MPC drum programs. Native sample pad editing.
Rhythmer KitPlay many drum sounds on one track. Change a complete kit, edit a selected pad, or open PAD SOURCE to replace its engine/sound.
Individual enginePlay one selected sound chromatically or in a scale. A drum instrument here is one pitched drum sound, not a complete kit.
MIDISend notes, controllers and program changes to external hardware. No internal audio is created by a MIDI-only track.

Coming from the stock workflow

The panel labels are familiar, but the project structure is different. Pick a track first; its type determines what the pads and pages do. A pattern belongs to that track. A scene changes several tracks together.

  • PAD BANK + pad selects a track. A bank within a kit is a separate selection.
  • SAMPLE opens the selected track’s Stage; hold it for a temporary Pads / Keys view. Use PAD FX + KNOB FX for TRACKS.
  • Tap SEQ to reach pattern pages. Hold SEQ + pad to launch a pattern.
  • Save deliberately with SHIFT + Pad 16 → SAVE. Do not rely on a background autosave.

03 / START HERE

Find your way around.

Tracks: the selected track and the project overview
Patterns: length, grid and swing
ControlGeneral action
B1 / B2 / B3The three soft keys above the screen. Read their current labels; the same key has different jobs on different pages.
K1 / K2 / K3The three controls shown in the bottom knob cards.
Encoder / PushTurn to browse or change focus; push to select. EDIT moves through the parameter list in groups of three.
SHIFT + PushGo back one page; in a confirmation, cancel.
SHIFT + − / +Undo / redo.
PAD BANK held + Pad 1–16Choose track 1–16.
SAMPLE held + padSelect a Sample Kit pad without sounding it.
PLAY / STOPStart / stop transport. SHIFT + PLAY continues from the current position.
SHIFT + STOPEnd held notes. Double STOP within 400 ms cuts all audio in the current RHYTHMER version.

If a physical knob is away from the value on screen, takeover prevents an immediate jump. Configure the response in Settings → KNOBS. Read the highlighted card and its secondary SHIFT value before changing it.

04 / MAKE SOUND

Choose a track, then a sound.

Hold PAD BANK + track pad → release → tap SAMPLE → Stage

Stage is the selected track’s sound home. Tap SAMPLE from another page to reach it; tapping SAMPLE again returns Stage to its first sound page. Holding SAMPLE shows the track’s Pads / Keys view temporarily. Tracks is reached with PAD FX + KNOB FX.

For an overview, press PAD FX + KNOB FX together to open TRACKS. Turn the encoder or tap its numbered pad to select it; Push opens its Stage. An unused track, or one deliberately set to EMPTY, opens the same type-selection carousel. A Sample Kit with no audio loaded is still an assigned Sample Kit.

What you wantExact route
Add an instrument to EMPTYOpen its Stage → turn to PLUG-IN → Push → select engine → Push.
Make a native Sample KitEMPTY Stage → KIT card / B2 KIT. Use SAMPLE SELECT to load the selected pad.
Use external MIDIEMPTY Stage → MIDI card / B3 MIDI, then configure device, port and channel.
Open a loaded trackPAD BANK + track pad → SAMPLE; or TRACKS → select → Push.
Change only the instrumentTRACK SETUP → CHANGE PLUG-IN; or plug-in PRESETS list → B2 PLUG-INS.
Choose another sound in this engineStage PRESETS → Push → browse → Push / B3 LOAD.

Change an instrument or track type.

PAD BANK + track pad → PAD FX + KNOB FX → B1 TRACK SETUP

  1. Hold PAD BANK and tap the destination track’s numbered pad. Release PAD BANK.
  2. Press PAD FX + KNOB FX together for TRACKS. Press B1 TRACK SETUP. Check the header’s track number before continuing.
  3. Turn the encoder to CHANGE PLUG-IN to replace a plug-in, or TRACK TYPE to choose PLUG-IN / SAMPLE KIT / MIDI / EMPTY. Push or the labelled SELECT key enters the choice.
  4. Choose the type or instrument and confirm. A completed change opens that track’s Stage. For Break Engine, choose and decode a loop before the replacement takes effect.
TRACK SETUP: actions for the selected track
TRACK TYPE: PLUG-IN, SAMPLE KIT, MIDI or EMPTY

TRACK TYPE changes the sound family while keeping all 128 patterns, the current pattern, playback speed, mixer and inserts. EMPTY removes the instrument and keeps the sequence. Source-specific pad and modulation state resets when changing family; existing notes are not remapped to a new instrument.

LOAD MPC KIT loads only the chosen kit into this track and preserves its patterns. It does not open the whole project. Cancel returns without replacing the current sound. Use SHIFT + Minus to undo an accepted instrument or type change, and SHIFT + Plus to redo it.

Cancel, go back and recover a mistake.

  • Before loading: follow B1 BACK / CANCEL. In a browser, Back may first move up one folder; keep going until you return to the caller. SHIFT + encoder Push follows Back.
  • In TRACK TYPE: Back returns to TRACK SETUP first; another Back returns to TRACKS.
  • In a confirmation: B1 CANCEL or SHIFT + Push cancels, even if the affirmative answer is selected. Plain Push or B3 confirms.
  • After an accepted replacement or deletion: SHIFT + − undoes it; SHIFT + + redoes it. Undo is not advertised for every internal plug-in parameter.
  • After changing tracks in a preset/load screen: continue from the new track’s Stage. The old track’s browser is closed. A file load already started keeps its original target; changing tracks does not redirect its result.
  • During recording: finish recording before replacing the instrument/type. A frozen track asks to unfreeze before a change.

Use LOAD MPC KIT for a kit-only import. Use SHIFT + Pad 16 → OPEN when you intend to open an entire project. These are different operations.

05 / MAKE SOUND

Sample Kit: your own material.

Empty track → KIT · SAMPLE SELECT → choose a file → Push

Sample Kit is the native sampling path. It is separate from Rhythmer Kit, which hosts synthesis engines. A Sample Kit can address 128 pads over banks A–H; the project’s sample pool and an engine’s internal voices are different limits.

Stage keyPages
B1SOUND · TRIM · LAYERS · TUNE · AMP ENV
B2PLAY · COLOUR · FOLLOW · CLOUD
B3MIX · SENDS · FILTER · FILT ENV · KIT FILT

Press the lit soft key again to cycle its pages. Hit a pad to select the sample being edited. TRIM sets start/end/loop point; MIX changes pad/kit level and pan; TUNE changes pitch and Warp; PLAY contains voice and mute-group behavior. FILTER affects the selected pad, while KIT FILT processes the kit as a whole.

Load, chop, tune

  1. Open SAMPLE SELECT on a Sample Kit, browse the card and Push to load the file onto the chosen pad. Preserve its source file when moving the project.
  2. Use TRIM to set a useful region. CHOP opens slicing; its slice selection and TO PADS action place regions onto pads.
  3. Use TUNE / FOLLOW to fit the material to your tempo. Beats, Tones and Tape have different pitch/time behavior; start by listening to a simple pattern.
Native Chop: sample regions and TO PADS
Record: source, length and threshold

Record audio

SAMPLE RECORD opens recording for a Sample Kit. Choose the input source, length and threshold; tap a target pad to start, and use STOP, Push or the pad again to finish. SHIFT + SAMPLE opens Input Config for source, gain and monitoring. Set monitoring intentionally to avoid recording a feedback loop.

Resample records internal sound. Audio Recall retrieves recent audio; sequence Recall retrieves played notes. They are different functions. Supported MPC .xpm/.xty programs can supply a kit; importing does not guarantee an exact recreation of every proprietary stock effect or setting.

06 / MAKE SOUND

Rhythmer Kit: build a whole drum part.

Empty track → PLUG-IN → Rhythmer Kit → PRESETS

Start with one of 36 complete kits, each with 16 populated pads. Select the kit in PRESETS with the encoder or K1, then Push / LOAD. A kit is one track containing many sounds.

Rhythmer Kit PRESETS: whole-kit filter and the selected kit
PAD SOURCE: choose Pad, Engine and Sound
WhereWhat it changes
PRESETS → choose → Push / LOADThe complete kit.
Stage B1 EDIT → Push → PAD SOURCEPad / Engine / Sound: replace only the selected pad.
Separate editor B3: PAD SOURCE → SAVE → EDITCycle the three edit views.
EDIT first row: KIT CUTOFF / KIT RESONANCE / KIT FILTER TYPEThe whole kit sum. ALL PADS identifies this scope.
EDIT subsequent rows: P01–P16The selected pad’s original sound controls.
SAVE → slot → Save KitK1 slot 1–64 → turn K2 Save Kit → wait for Status Ready. Stores the complete kit, pad overrides and whole-kit filter.
Stage B3 MIX / SENDS / FXTrack-level mixer and effects.

In PAD SOURCE, K1 selects Pad, K2 selects Engine and K3 selects Sound. Hit a pad or turn Pad to change the edit focus. A P11 label means the eleventh destination pad. Check that pad number and source before editing. Pad-source effects belong to that engine instance; the kit filter, host PERFORM controls and track sends are separate.

Rhythmer Kit · hit-responsive drum geometry
Rhythmer Kit · hit-responsive drum geometry

07 / MAKE SOUND

One engine. One playable sound.

Empty track → PLUG-IN → engine → PRESETS

Load an individual engine for a bass, melody or one playable percussion voice. Turn the encoder or K1 in PRESETS, then Push / LOAD to select a program. Merely moving through the list does not load a program. Stage PRESETS retains its native audition behavior: turning there can change the sound after a short delay. The opened preset list instead waits for Push / LOAD. Save your work before auditioning another factory preset.

Instrument PRESETS: the engine, original preset name and quick controls
Original preset list: browse, then LOAD

The first controls mirror the engine’s filter/resonance or representative sound controls. B2 opens PERFORM with DJ FILTER, ECHO and SPACE, followed by ARP / CHORD. B3 retains MIX / SENDS / FX. Press B1 until EDIT is selected for Stage EDIT and its original sound controls.

To save a reusable sound, tap SAMPLE, press B1 for EDIT and Push the encoder at PUSH: SAVE SOUND. In SAVE, K1 chooses slot 1–64 and turning K2 Save Sound to SAVE writes it. Wait for Status Ready. B2 PRESETS lists it as User Sound 01, 02, and so on; select it and Push / LOAD. A used slot is overwritten. Save the project separately for patterns and arrangement.

08 / MAKE SOUND

Shape the sound in EDIT.

SAMPLE → B1 EDIT → K1–K3 · Push → source / save tools

Native EDIT: six-line control list, current position and three knob cards

Tap SAMPLE, then press B1 until EDIT is selected. Stage B1 still cycles PRESETS / EDIT. Turn the encoder or − / + to browse sound controls; Push opens the source/save tools shown by the visible hint. Individual engines start on SAVE and Rhythmer Kit starts on PAD SOURCE. B2 PERFORM / ARP / CHORD and B3 MIX / SENDS / FX on Stage keep their existing jobs. Third-party plug-ins without Rhythmer’s tool layout retain native Push behavior. The sound-control view keeps the native six-line list. Turn the encoder or use − / + to move by three controls; K1–K3 adjust the visible active row. Position and total are shown. Original EDIT, ENV, LFO and FX controls follow their source order with the original units. There is no extra MAIN or PAGES menu.

Control / viewAction
Encoder / − / +Move by three parameters in EDIT.
K1 / K2 / K3Change the corresponding highlighted values.
B3 in the separate full editorCycle SAVE / EDIT.
B3 in the separate kit editorCycle PAD SOURCE → SAVE → EDIT.
Kit first rowWhole-kit filter; ALL PADS.
Kit following rowsFocused pad controls; check P01–P16.
B2 PERFORM from StageDJ FILTER / ECHO / SPACE, separate from native sound effects.

Dexed, DRUM-X, Plaits, CS-1 and MONO2K have OUTPUT CUTOFF, OUTPUT RESONANCE and OUTPUT FILTER TYPE in their first EDIT row. At 100% cutoff, 0% resonance and LP they bypass without altering the original output. Factory selection resets these additions to neutral; User Sound and project saves keep your settings.

09 / MAKE SOUND

The sound palette.

Twenty entries appear in the selected plug-in list. Sample Kit and MIDI remain native track choices outside that list. Original instrument names identify the sound sources; a model choice inside an engine is not automatically a separate preset bank.

These symbolic graphics give each engine its own visual character. The examples move without playing audio; pause them to study a screen. Reduce Motion preferences are respected.

20 ENGINE MOTION EXAMPLES / SOUND OFF
Rhythmer Kit screen
DRUMS

Rhythmer Kit

A whole kit. A new starting point.

Acid Engine screen
BASS

Acid Engine

Follow the squelch.

Break Engine screen
SAMPLER

Break Engine

A loop is only the beginning.

Sophie screen
DRUMS

Sophie

Small hits. Big personality.

Elixir screen
DRUMS

Elixir

Percussion beyond the familiar.

Aphex screen
SYNTHS

Aphex

Take the less obvious turn.

FM-106 screen
SYNTHS

FM-106

A little frequency friction.

FMini-1 screen
SYNTHS

FMini-1

Make room for FM.

CS-1 screen
SYNTHS

CS-1

Start simple. Shape something yours.

OberVave screen
SYNTHS

OberVave

Oscillators with room to move.

K-WASUB screen
SYNTHS

K-WASUB

Go deep under the groove.

Hera screen
SYNTHS

Hera

A familiar warmth. A fresh context.

Braids screen
SYNTHS

Braids

One voice. Many directions.

Plaits screen
SYNTHS

Plaits

Different models. Different moods.

Hortator screen
DRUMS

Hortator

Find another kind of knock.

MONO2K screen
SYNTHS

MONO2K

A machine within the machine.

Prophet screen
SYNTHS

Prophet

Shape the next phrase.

S1Vave screen
SYNTHS

S1Vave

Another voice in the box.

Dexed screen
SYNTHS

Dexed

FM, with depth.

Guru-600 screen
SYNTHS

Guru-600

From a patch to a part.

10 / BUILD A GROOVE

Record, edit and perform patterns.

SEQ → PATTERNS · use the labelled SEQUENCE hub for STEPS / ROLL / MOTION

Patterns sets length, grid and swing: K1 length, K2 grid, K3 swing. A one-bar pattern on a 1/16 grid gives sixteen step positions in 4/4. Long native patterns and the Acid Generator’s 1–64-step operating range are not the same limit.

  1. Select a track and an empty pattern. Hold SEQ and press a pad to select a pattern slot.
  2. Tap SAMPLE to return to Stage. Press SEQ RECORD to arm, then PLAY and perform the part. PATTERNS pads select or launch patterns, not notes.
  3. Add notes over successive loops. Press SEQ RECORD again to stop recording while playback continues.
  4. Use SHIFT + − to undo the last recording take. Use SHIFT + + to redo.

Choose the right editor

PageUse
STEPSSet or clear steps. K1 length, K2 velocity, K3 probability. Hold a step to edit its locks. On a kit, select the sound/lane you intend to enter.
TRIGPress STEPS again for ratchet, ramp and conditional triggering. Fill conditions respond while PLAY is held during playback.
EUCLIDThe native kit variation layer: hits, steps and rotation.
ROLLPitch/pad rows with note length, velocity and probability. The note sheet provides accent, slide, tie and deletion.
STEP EDITSHIFT + SEQ for stopped, one-step-at-a-time note entry. REST advances without adding a note.
MOTIONRecorded knob changes. Turn controls with sequence recording enabled; erase a lane with ERASE plus that control.

Patterns, scenes and Recall

Hold SEQ and press a pad to queue that track’s pattern. Several pad choices form a pattern chain. Hold SEQ + SHIFT and press a pad to launch the corresponding scene across tracks. A pattern launch normally waits for the next bar while transport runs.

SHIFT + SEQ RECORD recalls the recent played phrase into the next empty patterns on the tracks that played. It records notes rather than sampling audio. Keep this distinction when deciding between Recall, Audio Recall and resampling.

11 / BUILD A GROOVE

Generate an idea. Keep what works.

SEQ → PATTERNS → SHIFT + B3 → GEN

GEN: operations and their target
GEN SETUP: example group T9–T12

GEN uses the FM-1 Rhythmer generator lineage. K1 sets Energy, K2 selects Explore / Random / a genre, and K3 sets Seed. Turn the encoder to an operation, then Push or APPLY. Read both the target range and NEW SOUNDS / KEEP SOUNDS message before applying.

OperationWhat changes
GENERATE SONGThe selected four-track group: first track gets Rhythmer Kit; three melodic roles get sounds and notes. Root, scale and tempo can also change project-wide.
MUTATE SONGPatterns in that group, preserving its instruments.
GENERATE Tn / MUTATE TnThe selected track’s current pattern, keeping its instrument.
ENGINE GENACID GEN on Acid Engine; BREAK GEN on Break Engine; otherwise the retained variation tools.
GEN SETUPChoose SOUND + MIDI or MIDI ONLY, and the appropriate target.

SOUND + MIDI vs MIDI ONLY

SOUND + MIDI uses one group: T1–T4, T5–T8, T9–T12 or T13–T16. K1 SONG GROUP selects it. Tracks outside that group retain their patterns and sounds, but project root/scale/tempo are shared.

MIDI ONLY uses its own inclusive MIDI FROM / MIDI TO range. Equal endpoints target one track. It generates note data without assigning instruments, so load suitable sounds yourself. These two target settings are remembered separately.

MIDI ONLY: an inclusive one-track target

Seed, Undo and navigation

Reapplying Generate Song without adjusting its settings chooses a new seed while avoiding the last eight random draws. Enter a previous seed to return to the same starting conditions. Mutate also uses the existing pattern as input. Undo restores the operation’s pattern, sound and relevant project changes together.

B2 cycles GEN → VARY → GEN SETUP → GEN; its label shows the next destination. OPEN enters a subpage, APPLY runs an operation, SELECT confirms the group and DONE returns from the MIDI range screen. Back from engine GEN returns to main GEN; Back again returns to PATTERNS. Screen BACK and SHIFT + Push follow the same GEN hierarchy.

12 / BUILD A GROOVE

Acid Generator.

Acid Engine track → SEQ → PATTERNS → SHIFT + B3 → ACID GEN

Generate a bassline specifically for the Acid Engine, then mutate it while keeping the changes on this track. This is the dedicated TB-3PO-derived Acid Generator from the FM-1 lineage, not the generic song generator with a different sound attached.

Acid Engine · resonant tunnel
Acid Engine · resonant tunnel
ACID GEN: Density, Accent and Slide
ACID GEN: Octaves, Base Octave and Auto Mutate
SETTINGS pageControls
1 / 2Density 0–100% · Accent 0–100% · Slide 0–100%
2 / 2Octaves 1–3 · Base Octave 0–4 · Auto Mutate OFF or every 1–16 bars
  1. Load Acid Engine on the track and choose a pattern between 1 and 64 steps.
  2. Open ACID GEN. Use B2 SETTINGS to cycle its two settings pages.
  3. Start with the inherited defaults: Density 70, Accent 40, Slide 25, Octaves 2, Base Octave 1. The project supplies key and scale.
  4. Choose GENERATE ACID for a new line, or MUTATE ACID to vary the current line.
  5. Play the result. Shape the instrument’s cutoff, resonance and envelope separately in sound design; return to GEN when you want new notes.

Accent becomes the original 127/96 velocity distinction. Slides become sequence slide commands; ties lengthen an existing note rather than retriggering it, including across pattern boundaries. Acid has its own track-local random state; it does not share the four-track GEN seed.

Finished your first beat? Add an acid part next ↗

13 / BUILD A GROOVE

Break Manipulator.

Break track → SEQ / PATTERNS → SHIFT + B3 GEN → ENGINE GEN / BREAK GEN → BRK PERF

Break Engine prepares a loop; Break GEN rearranges its slices; Break Manipulator is the six-page BRK PERF interface for playing those slices, rolls and A/B source changes. It brings the FM-1 performance approach into the MPC Sample workflow.

Break Engine · segmented tape loop
Break Engine · segmented tape loop

Prepare the source once

  1. Select Break Engine. In its browser set K1 LOAD BARS to the actual loop length: 1, 2, 3 or 4 bars in 4/4.
  2. Select your audio file and Push. The whole source is divided into sixteen equal regions, placed on the current bank’s pads, and aligned using the declared length.
  3. Play STRAIGHT first. Confirm that the source length and downbeat are correct before changing the arrangement.
  4. Open BRK PERF from the Break menu or the Break editing view.
Break source browser: declare LOAD BARS before loading
BREAK menu: generation and BRK PERF

Generate a new chop pattern

ActionResult
STRAIGHTReplay source-order slices across the pattern. Use it to check alignment.
GENRE CHOPSCreate a genre-based slice arrangement and fills.
RANDOM CHOPSRearrange slices while retaining the opening downbeat; stronger Energy can add retriggers.
MUTATE CHOPSChange offbeat slices while preserving quarter-note anchors and automation. Start with an existing pattern.
TAIL FILLAdd end-of-pattern slice fills and 2× / 4× ratchets.
BROWSE SAMPLELoad or reinterpret the source; LOAD BARS affects the next load.

K2 Genre and K3 Seed shape generation; the main GEN Energy controls Random/Mutate intensity. To change an existing loop’s bar interpretation, set LOAD BARS and load that file again. Break’s dedicated performance DSP is mono; stereo source material is summed for that path.

14 / BUILD A GROOVE

Six pages. Hands on the break.

BRK PERF 1 / 6: CHOPS
BRK PERF 2 / 6: ROLLS / HOLD PADS
PagePlay / shape
1 · CHOPSPads 1–16 play slices. Orbit, DJ Filter and Loop Hold (Freeze) on the knob cards.
2 · ROLLS / HOLD PADSHold a pad for Repeat, pitch Up/Down, Shrink, Build, Stretch or Echo. Release to end the held command.
3 · SOURCE A / BPad 1 selects A; Pad 2 selects B; Pad 3 returns to straight playback. Play Mode, Freeze and DJ Filter remain available.
4 · LOOP VARIATIONSVariation, Drift and Tail Fill. Variation/Drift apply from the next phrase in LOOP mode.
5 · GRAIN / STRETCHGrain size, seam crossfade and 2–4× stretching at source pitch.
6 · TRACK MIXWhole-track level, pan and Send A.

Roll pads, as they sit on the hardware

PAD 131/32 Repeat
PAD 141/32 Down
PAD 151/32 Up
PAD 161/32 Shrink
PAD 91/16 Repeat
PAD 101/16 Down
PAD 111/16 Up
PAD 121/16 Shrink
PAD 51/8 Repeat
PAD 61/8 Down
PAD 71/8 Up
PAD 81/8 Shrink
PAD 11/4 Repeat
PAD 2Build
PAD 3Stretch
PAD 4Echo
BRK PERF 3 / 6: select A, B or Return
BRK PERF 5 / 6: GRAIN / STRETCH

A/B sources and CHOP vs LOOP

On SOURCE A / B, LOAD B opens the second loop. Both sources use the same declared bar count, even when their files contain different frame counts. Load B before selecting it. RETURN restores the straight source/variation state.

CHOP follows the slices written in the sequence. LOOP follows the internal break phrase while the sequence gate is open, including Variation and Drift. A newly generated slice pattern starts in CHOP; choose LOOP when exploring phrase variations.

Record a performance

  1. Start transport with Record + Play enabled on the Break track.
  2. On ROLLS or SOURCE, hold the performance pads as you play. Command type and held length are written into the current sequence.
  3. Play it back: the recorded rolls and A/B/Return commands are recalled. Steps, Step Edit and Roll display command names.
  4. Hold a step and turn the encoder to change its Chop/Roll/A/B/Return command. This edits the performance instead of replacing the whole pattern.

Turn or push the encoder to move through BRK PERF pages. GEN returns to Break’s generation menu; its BACK returns to main GEN. Use RETURN when you want to remove the current variation/held performance state. Save the project with its user loops.

15 / FINISH & CONNECT

Turn patterns into an arrangement.

SHIFT + Pad 12 → SONG

Song: pattern clips on track lanes
Song EXPORT: mixdown, stems or MIDI

Each lane belongs to one track. Choose a lane with the pads; turn the encoder to move by bars. K1 zooms the timeline, while K2/K3 choose a clip’s pattern and duration. B3 places a clip or duplicates the selected one. Push opens its notes; ERASE removes the selected clip.

When Song runs, launched patterns can be captured as clips. CHOP splits a clip at the cursor; LOOP loops its bar range. Use markers and tempo changes to structure an arrangement rather than assuming every pattern on every track must have the same length.

Export

Open EXPORT with B1. Select a WAV mixdown, stems or a MIDI file, then export with B2. WAV choices include 32-bit float, 24-bit and 16-bit. NEW PATTERN writes the song into patterns instead of rendering audio. MIDI export contains events, not the sound of the engines.

The RHYTHMER card paths use Rhythmer/Mixdowns, Rhythmer/Stems and Rhythmer/MIDI. Keep the card mounted and give the render time to finish. Verify the resulting files before clearing the source project.

16 / FINISH & CONNECT

Capture a performance as audio.

LOOP + 16 LEVELS → LOOPER

Looper: four audio loops following the project tempo

L1–L4 are audio loops, separate from note patterns. Enable the Looper first with B3 or Push. K1 selects the loop, K2 its length and K3 its level. SHIFT exposes feedback, quantization and the action after recording.

  1. Open MORE and select SOURCE: input, a track, another loop or the mix.
  2. Start playback. Push the encoder to queue recording at the next bar.
  3. Push again to close the loop at a bar boundary and play it.
  4. Push during playback to overdub, then again to finish overdubbing.
Pad rowLoop job (one column per loop)
13–16Record / overdub / play
9–12Queue play/stop for the next bar; SHIFT makes it immediate.
5–8Undo / redo the previous overdub.
1–4 heldClear the corresponding loop.

MORE → COMMIT places a loop onto the next empty pad of the selected Sample Kit. The Looper’s MIX page and effect chains shape its audio. Loops save alongside the project; preserve those accompanying files when moving it.

17 / FINISH & CONNECT

Mix at the right level.

PAD FX + KNOB FX → TRACKS → B2 SENDS · SHIFT + KNOB FX → chains

The signal path is: source → track effects → track level/pan → sends A–D → bus effects/return → master effects/compressor → MAIN VOLUME. A native Sample Kit can additionally use a pad chain before the track chain. Original engine FX live inside the source and are separate from these host effects.

Track effects: select a slot, add or edit an effect
LocationUse
TracksSet each track’s level/pan, watch its activity and identify expensive parts.
SendsChoose bus A–D and set the selected track’s send plus the bus return.
Track / Bus / Master chainSix slots per chain. Turn to a slot; Push + to add an effect; Push an existing effect to edit it.
Knob FX / Pad FXHands-on performance processing, retained from the foundation workflow.
Compressor / Gate KEYUse a track or bus as a sidechain source where the effect exposes KEY.

In a chain, B1/B3 move among its scopes; BYPASS toggles the selected effect, and MORE changes, moves or removes it. K1–K3 edit the displayed values; −/+ accesses the next row. Delay SYNC uses musical note values where available.

A useful first balance

  1. Lower the loudest pad in EDIT, not only the whole kit.
  2. Set the kit’s overall level on Stage MIX. Bring the bass and other tracks around it on Tracks.
  3. Add sends deliberately and check bus returns. If a sound already has long internal reverb/delay, keep the host send low initially.
  4. Watch the master for overload. Loud preview audio does not establish a safe project mix.

Record knob changes as Motion for repeatable filter or effect moves. For deliberate cross-modulation, use MOD assignments and separate parameter ranges. Macros move several parameters from one control; they do not replace the instrument’s original internal modulation.

18 / FINISH & CONNECT

Connect external instruments.

SHIFT + Pad 8 → MIDI

Choose the external MIDI jacks or USB, then set input/output channels and sync mode. An input on the selected-track channel follows the selected track; a dedicated track channel addresses that track directly. MIDI-only tracks need external audio routing to hear the receiving instrument.

SettingPurpose
In / Out / Track channelRoute incoming notes and outgoing events intentionally.
Pad MIDI in/outChoose whether pad events are routed Never, Always or only when Empty.
Sync in/outMIDI Clock or MTC where supported. External sync status appears in the header.
MIDI thruForward incoming events; avoid a feedback loop with your interface.
Receive program changeLaunch patterns from program changes when enabled.
MIDI panicEnd held notes on all channels/ports.

The inherited input path accepts note/pressure data, pitch bend and mod wheel on supported plug-in/MIDI tracks. A native kit begins at MIDI note 36 for A01. Each engine may implement a different subset of expressive controls. Start with one cable path and one channel, then add clock after note routing works.

19 / FINISH & CONNECT

Save the project and its sound.

SHIFT + Pad 16 → SAVE / OPEN / NEW

Project: SAVE, OPEN and NEW

Save the project for patterns, arrangement, track/kit state and sample references. Save Sound / Save Kit creates a reusable user preset instead. A preset does not replace a project save.

What you saveWhere / what to keep
ProjectRhythmer/Projects and associated project files/folders. Preserve referenced user audio.
User Sound / User KitRhythmer/Presets; slots 1–64 per host view. Wait for Ready.
Recorded samplesSamples/Recorded. Keep source recordings with the card backup.
Plug-insRhythmer/Plugins plus required data/sidecars. Existing top-level Plugins paths remain readable. A project does not contain every plug-in binary.
Mix / stems / MIDIRhythmer/Mixdowns, Rhythmer/Stems, Rhythmer/MIDI.

OPEN browses projects. MORE provides operations such as save-as, duplicate, rename and startup selection. Load kit (no patterns) imports kit material without replacing the arrangement. Opening stock MPC Sample projects follows the supported import path and creates a working copy; not every proprietary setting has an equivalent.

Save a preset, then reopen it.

  1. On the chosen track, tap SAMPLE → B1 EDIT → encoder Push. Read the visible SAVE SOUND or PAD SOURCE / SAVE prompt.
  2. For a kit, edit a pad in PAD SOURCE, then press B3 SAVE. For a single instrument, SAVE opens immediately.
  3. K1 selects slot 1–64. Turning K2 Save Sound / Save Kit to SAVE writes it. Wait for K3 Status Ready; if an error appears, check card access and storage before proceeding.
  4. B2 PRESETS / KIT PRESETS opens the list. Find User Sound NN / User Kit NN and Push / LOAD. A fresh track/project using the same engine or Rhythmer Kit reads these files too.
  5. SHIFT + Push returns from the tools to the Stage EDIT row you were using. Switching tracks follows normal current-track navigation.
On Stage EDIT, Push opens PAD SOURCE / SAVE. Development render.
PAD SOURCE: pad 11, its engine and its sound stay matched. Development render.
SAVE KIT: K1 chooses a slot; turn K2 to save and check K3 Status. Development render.

What TRANSPORT actually does

In the source/save tools, hold SHIFT: B3 becomes TRANSPORT. B3 toggles whether this plug-in receives the host’s playing/stopped state. ON lets transport-aware internal sequencers or arpeggiators follow playback. OFF reports stopped even while the OS plays. Notes still reach the instrument; this is not mute or global Play/Stop. Engines that do not use host playback state may sound the same in either setting.

Fine-edit without leaving the sound

On Stage EDIT, turn K1, K2 or K3 to choose the last-touched parameter, then hold SHIFT and turn the encoder for fine adjustment. Turning the encoder without SHIFT moves through rows of sound controls. Encoder Push on supported engines now opens source/save tools; it no longer cycles the three card selections as stock Melodee does. External plug-ins retain their original Push behavior.

Install and protect your work

Back up the entire card first, including projects, presets, user loops and plug-in data. For this first public beta, use the full SD package, preserving autorun/ and Rhythmer/ at the card root and engines in Rhythmer/Plugins. Later compatible signed UPDATE packages replace the app only, not engines or kits. Match the release version and SHA-256 before copying files. Installation, package choices and stock recovery ↗. The 0.4.0-beta.3 full SD package includes the updated app, plug-ins and catalogue. Physical-device validation remains pending.

For the current owner-test target, the launcher expects MPC Sample AC50 firmware 1.3.0.12. Treat that as a release-specific requirement, not support for every firmware revision. Do not use an FM-1 installer or a stock-app enhancement patch for this OS.

20 / FINISH & CONNECT

Freeze a part. Keep making music.

Freeze prints an instrument part so playback can use less processing. Deep Freeze also unloads the live instrument. The original foundation provides both options; use Unfreeze before editing the instrument or changing its notes.

Manual GEN and Break edits ask you to Unfreeze first. Automatic Acid mutation skips frozen tracks. Keep your source plug-ins and samples with the project so you can restore the editable part. Check the result on the actual device before building a larger session.

21 / REFERENCE

Set up the instrument for your hands.

SHIFT + Pad 8 → SETTINGS

Settings: pad, knob, screen, audio and MIDI pages
PageWhat to adjust
PADSPad response, pressure, lights, sequence duplication and Recall behavior.
KNOBSPickup, Scaled or Instant takeover for the knobs and performance controls.
SCREENDisplay options offered by the current build. RHYTHMER screens use its monochrome presentation.
AUDIOSample rate and buffer size. A longer buffer can ease dropouts; a shorter one reduces buffering delay.
SAMPLINGRecall and free recording preferences.
MIDIPorts, channels, routing and sync.
ABOUTLoad, dropouts, card space and source credits.

Settings apply across projects. Changing sample rate restarts the audio path. Test timing and CPU load on the actual MPC Sample, especially with multiple heavy engines or separately edited kit pads.

First installation

Use the complete SD package, including Rhythmer/Plugins, for this first public beta. Back up the card before copying files. UPDATE packages replace the app only and are not first-install packages. Use Rhythmer-signed packages; upstream Melodee update ZIPs are not Rhythmer updates.

Exit cleanly

Exit: STAY, POWER OFF or MPC APP

A short POWER press opens Exit. STAY returns to the session; POWER OFF saves and shuts down; MPC APP saves and switches back to the stock application for that boot. Use the matching release’s recovery instructions if startup fails. Do not remove the card while it is saving.

22 / REFERENCE

Keep the important controls close.

ControlActionWith SHIFT / context
SAMPLETap: selected track’s Stage. Hold: temporary Pads / Keys view.Input Config
SEQPatterns → editorStep Edit
PAD FX + KNOB FXTRACKS; then B1 TRACK SETUP to change instrument/typeRepeat/ARP may temporarily own the soft keys
PAD BANK held + padSelect track 1–16—
SEQ held + padLaunch the selected track’s patternLaunch a scene with SEQ + SHIFT + pad
SAMPLE SELECTBrowser appropriate to the trackSave Sample / Save Bank in the appropriate browser
SAMPLE RECORDRecord a sampleAudio Recall
SEQ RECORDArm / toggle pattern recordingRecall recent notes
PLAYPlay from start; hold during playback for FillContinue
STOPStop; double press cuts audio in this buildAll notes off
Encoder PushSelect / open; follow the current labelBack
− / +Context: octave, bank, page or selectionUndo / redo
LOOP + 16 LEVELSOpen Looper—

SHIFT + pad

PadActionPadAction
1Full Level9Fader
2Half Seq10Rec Quantize
3Double Seq11Resample
4Count-In12Song
5Compressor13Trim Sample
6Half Speed14Time Correct
7Double Speed15Warp: time stretch / pitch
8Settings (includes MIDI)16Project

23 / REFERENCE

When something gets in the way.

What happensCheck first
No sound after GENMIDI ONLY does not load instruments. Check the track’s engine, current pattern, mute, source level, mixer and output.
Only one drum sound playsYou may be on an individual percussion instrument. Use Rhythmer Kit for a complete kit, then verify each pad’s SOURCE assignment.
A pad is much louderReduce that sound in EDIT, then adjust the whole-kit level on Stage MIX. Preserve headroom before master processing.
Break timing is wrongCheck LOAD BARS and the true source start. Re-load with the correct 1–4-bar count and test STRAIGHT. It is not transient-based auto-chop.
Break variation seems inactiveVariation/Drift act in LOOP mode from the next phrase. Generated slice patterns begin in CHOP.
Source B will not playLoad B on SOURCE A / B first. Both A/B use the selected source-bar interpretation.
Acid controls are absentSelect an Acid Engine track before opening engine GEN. The dedicated generator works with 1–64 steps.
A knob does not move immediatelyCheck takeover mode and the selected edit row. The visible card may require pickup/scaling.
A long note keeps soundingStop and use SHIFT + STOP / double STOP. Check release, delay/reverb tails, sequenced ties and external sustain.
Crackles or late responseInspect load, reduce expensive voices/engines/effects and try a larger buffer. Measure on the hardware.
A project opens without its soundCheck the matching plug-in folders, their data and referenced samples on the card. A project is not a plug-in installer.

When reporting a beta issue, include the build version, engine/preset or kit, track/pattern, exact steps, and whether it survives a save/reload. A short screen/audio example makes a routing issue much easier to distinguish from a synthesis issue.

24 / REFERENCE

Built on shared knowledge.

This manual is based on the Melodee user guide by Kerem Kiliç (Ellic Studio) and contributors. It has been rewritten and adapted by jazzy rhythmer for RHYTHMER OS for MPC Sample, including its track choices, Rhythmer Kit, native PRESETS/EDIT interface, four-track GEN, dedicated Acid Generator and Break Manipulator. The original creators retain credit for their work.

Source / contributionCreditScope
Melodee / sample-baseKerem Kiliç (Ellic Studio) and contributorsSampler, sequencing, mixer, effects, driver/recovery and project foundations.
RHYTHMER OS for MPC Samplejazzy rhythmerEngine ports/adaptations, integration, Rhythmer Kit, GEN/Break additions and revised interface/workflow.
FM-1 generator lineageJuan Ignacio Antonucci (Juan Jiant), Leo Kuroshita / Hügelton Instruments, jazzy rhythmer and the credited FM-1 contributorsOriginal musical generation sources and adaptations.
Acid generationschwung-tb3po → Phazerville Hemisphere Suite / djphazer lineageDedicated generator ancestry; original source headers/notices retained.
Break performancePresethead Jungle Choppa; Amenity / FM1 Open contributors; M-VAVE; Rhythmer adaptation by jazzy rhythmerOriginal performance DSP and the subsequent host reader/state/command/UI integration.
SophieMatt Estela and digisophie contributorsOriginal instrument DSP; MIT notices retained.
HortatorDEADACTIVE and the Felucca / Skiff lineageOriginal percussion synthesis/models; dependency notices retained.
Elixirdmajka; Erica Synths LXR-02; Julian Schmidt / Sonic Potions; credited Mutable Instruments contributorsOriginal engine/FX lineage. Factory data terms are separate from software licences.
FM-1 instrumentsTheir original authors and dependencies, linked belowOriginal DSP authorship is separate from RHYTHMER’s host adaptation.
Move / Schwung instrumentsOriginal module and DSP authors, linked belowOriginal names and source attribution retained.
Open MPC / Schwung adapteropen-mpc/mpc-vst-plugins contributorsPlug-in hosting adaptation/wrapper foundation.
JUCE / RubikJUCE contributors / Rubik Project AuthorsFramework and font; original licence terms retained.

Documentation source and changes

Source and licence

The adapted manual and its generated HTML are provided under GNU AGPL-3.0-only. The readable HTML, styles and JavaScript are included with this static page. See documentation source notes for the pinned reference and adaptation record. Individual engine code, preset data, recordings, fonts and device marks keep their separate notices and terms; this manual does not relicense them.

Original engine projects

The MPC Sample device wordmark identifies the hardware. MPC Sample and associated marks belong to inMusic Brands, Inc. This independent project has no manufacturer or upstream endorsement. Thanks to the original authors and communities who made these instruments and tools possible.

25 / APPENDIX

Appendix: make your first groove.

Follow the same four-bar, 140 BPM session as the film: Rhythmer Kit drums, FMini-1 bass, FM-106 pad chords, Acid Generator and Think break, then Filter + Plate, mixer balance and track-mute jamming.

Watch the complete session above, then open the step-by-step guide for the notes, button combinations, screen walkthroughs and mix settings.

YOUR FIRST GROOVE WITH RHYTHMER OS. ↗