REGGAE-OS
Screenshot quick guide

ROOTS ORGAN

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · HARM	Harmonic registration
K2 · TONE	Upper harmonics/brightness
K3 · ROTOR	Rotary mode/speed
K4 · DRIVE	Saturation drive

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

ROCKSTEADY

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · HARM	Harmonic registration
K2 · TONE	Upper harmonics/brightness
K3 · ROTOR	Rotary mode/speed
K4 · DRIVE	Saturation drive

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

DEEP ROOTS

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · CUTOFF	Filter cutoff
K2 · RES	Filter resonance
K3 · ENV	Filter envelope amount
K4 · DRIVE	Saturation drive

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

DIGITAL BASS

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · CUTOFF	Filter cutoff
K2 · RES	Filter resonance
K3 · ENV	Filter envelope amount
K4 · DRIVE	Saturation drive

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

REED MELODICA

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · ATTACK	Breath-style attack time
K2 · TONE	Filter cutoff/brightness
K3 · VIBRATO	Pitch vibrato depth
K4 · RELEASE	Release time

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

WARM TINE

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · TIMBRE	FM modulator level/brightness
K2 · ENV	FM modulator envelope-rate offset
K3 · CHORUS	Chorus send
K4 · DETUNE	Detune

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

PIANO CHOP

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · TONE	Filter cutoff/brightness
K2 · DECAY	Decay time
K3 · DRIVE	Saturation drive
K4 · RELEASE	Release time

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

ROOTS TRUMPET

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · TONE	Filter cutoff/brightness
K2 · ATTACK	Attack time
K3 · DECAY	Decay time
K4 · RELEASE	Release time

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

MUTED SKANK

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · BRIGHT	String brightness
K2 · DAMP	String damping
K3 · PLUCK	Pluck/excitation position
K4 · RELEASE	Release time

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

DUB WAIL

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · PITCH	Pitch envelope amount
K2 · RATE	LFO modulation rate
K3 · ECHO	Delay send
K4 · TONE	Filter cutoff

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

ROUND FM BASS

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · TIMBRE	FM modulator level/brightness
K2 · ENV	FM modulator envelope-rate offset
K3 · RATIO	Modulator ratio offset
K4 · LEVEL	Track level

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

DUB DRAWBARS

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · HARM	Harmonic registration
K2 · TONE	Upper harmonics/brightness
K3 · ROTOR	Rotary mode/speed
K4 · ECHO	Delay send

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

ROOTS KIT

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · TONE	Drum tone
K2 · DECAY	Drum decay
K3 · SNAP	Snare/transient snap
K4 · DRIVE	Drive

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

JUNGLE SIGNAL

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · FALL	Pitch envelope amount
K2 · LENGTH	Amplitude decay length
K3 · ECHO	Delay send
K4 · TONE	Filter cutoff

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

FAST ALARM

HOME, then choose a track with ALGORITHM and sound with PRESETS

Play the selected instrument and use its four performance controls.

Knob / label	What it does
K1 · RANGE	Pitch modulation range
K2 · RATE	Modulation rate
K3 · ECHO	Delay send
K4 · TONE	Filter cutoff

Tap HOME through MIXER and CLOCK to return here. T4’s curated browser stays on drums; advanced EDIT pages can change its engine. These controls edit the sound you hear; save the project or a user sound to keep changes.

ENV

Tap ENV to enter its pages; tap again to cycle to ENV

Shape the loudness of each note. Try a short attack and release for crisp chops.

Knob / label	What it does
K1 · ATK	Time to rise after a key press
K2 · DEC	Time to fall to the sustain level
K3 · SUS	Level while the key stays held
K4 · REL	Time to fade after releasing the key

ENV DEST

Tap ENV to enter its pages; tap again to cycle to ENV DEST

Let the note envelope move other parts of the sound.

Knob / label	What it does
K1 · FLT	Filter movement amount
K2 · PIT	Pitch movement amount
K3 · SHP	Engine-specific waveform/timbre movement amount
K4 · ESYNC	Tempo-synchronised envelope timing

LFO

Tap LFO to enter its pages; tap again to cycle to LFO

Add repeating movement to the selected sound.

Knob / label	What it does
K1 · RATE	Modulation speed
K2 · WAVE	Modulation waveform
K3 · PHS	Starting phase
K4 · FADE	Time for modulation to fade in

LFO 2

Tap LFO to enter its pages; tap again to cycle to LFO 2

Choose how the LFO starts and follows the beat.

Knob / label	What it does
K1 · SYNC	Free-running or tempo-synchronised timing
K2 · TRIG	Note-trigger/restart behaviour
K3 · POL	Positive-only or bipolar movement
K4 · —	Unused

LFO DEST

Tap LFO to enter its pages; tap again to cycle to LFO DEST

Decide what the LFO moves. Start with small amounts.

Knob / label	What it does
K1 · PIT	Pitch modulation depth (vibrato)
K2 · FLT	Filter modulation depth
K3 · SHP	Engine-specific timbre modulation depth
K4 · AMP	Amplitude modulation depth (tremolo)

MOD

Tap LFO to enter its pages; tap again to cycle to MOD

Connect a modulation source to a sound parameter.

Knob / label	What it does
K1 · SLOT	Select a modulation slot
K2 · SRC	Select the source
K3 · DST	Select the destination
K4 · AMT	Amount and direction of the modulation

FX

Tap FX to enter its pages; tap again to cycle to FX

Set the selected track’s distortion and effect sends.

Knob / label	What it does
K1 · DST	Distortion amount
K2 · CHO	Chorus send
K3 · DLY	Delay send
K4 · REV	Reverb send

Raise a send to hear its effect. The later delay, reverb and chorus pages set the shared effects for all tracks.

SLICER

Tap FX to enter its pages; tap again to cycle to SLICER

Chop a sustained sound into rhythmic pulses.

Knob / label	What it does
K1 · SLCR	Slicer mode
K2 · PAT	Rhythm pattern
K3 · RATE	Chopping speed
K4 · DEPTH	Chopping depth

INSERT

Tap FX to enter its pages; tap again to cycle to INSERT

Process the selected track through an insert effect.

Knob / label	What it does
K1 · INSRT	Choose OFF, SOFT, HARD, FOLD, FUZZ, CRUSH, PHASR, FLANG or CHOR
K2 · INS A	Drive for distortion; bit depth for CRUSH; speed for swept effects
K3 · INS B	Tone for distortion; sample rate for CRUSH; depth for swept effects
K4 · INS C	Output level for distortion; low-pass cutoff for CRUSH; feedback for swept effects

The labels change with the effect type. OFF leaves A/B/C inactive. Use INSERT 2 to blend the result.

INSERT 2

Tap FX to enter its pages; tap again to cycle to INSERT 2

Blend the track’s insert effect with its original sound.

Knob / label	What it does
K1 · MIX	Dry/wet mix
K2 · —	Unused
K3 · —	Unused
K4 · —	Unused

DLY

Tap FX to enter its pages; tap again to cycle to DLY

Set the shared dub delay.

Knob / label	What it does
K1 · TIME	Delay-time division
K2 · FDBK	Repeat feedback
K3 · COLR	Repeat tone/colour
K4 · MIX	Delay return mix

Raise DLY on the track’s FX page to feed the delay. High feedback creates long tails; lower it to let the repeats die away.

REVERB

Tap FX to enter its pages; tap again to cycle to REVERB

Set the shared reverb space.

Knob / label	What it does
K1 · TYPE	Room, spring or hall model
K2 · SIZE	Space size/decay character
K3 · DAMP	High-frequency damping
K4 · —	Unused

Raise the track’s REV send on FX, or use the mixer’s REVERB mode.

CHORUS

Tap FX to enter its pages; tap again to cycle to CHORUS

Set the shared chorus movement.

Knob / label	What it does
K1 · CRT	Modulation speed
K2 · CDP	Modulation depth
K3 · —	Unused
K4 · —	Unused

Raise CHO on the track’s FX page to hear the chorus.

SCL

Tap SCL to enter its pages; tap again to cycle to SCL

Keep notes in a chosen musical key, or transpose a part.

Knob / label	What it does
K1 · ROOT	Key/root note
K2 · SCL	Scale
K3 · QNT	Keyboard quantisation mode
K4 · TRN	Transpose in semitones

ROOT sets the scale’s key; it does not replace the note you play. Quantisation and transpose happen before chord generation.

CHORD

Tap SCL to enter its pages; tap again to cycle to CHORD

Play a complete chord from one key.

Knob / label	What it does
K1 · ROOT	Key/root for scale-based chords
K2 · SCL	Scale used by DIA3 and DIA7
K3 · CHRD	Chord type; OFF returns single notes
K4 · VOIC	CLOSE, OPEN, INV1, INV2, +OCT or AUTO voice leading

Choose a polyphonic organ or piano, set CHRD to MAJ6 or MIN9, then play a key. Fixed chord types follow that key; DIA3/DIA7 build chords from the selected scale. See the chord table above.

EDIT 1 / ANALOG

Tap EDIT to enter its pages; tap again to cycle to EDIT 1

Oscillators and noise.

Knob / label	What it does
K1 · WAVE	Waveform
K2 · DTN	Oscillator detune
K3 · MIX	Oscillator balance
K4 · NOIS	Noise level

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 1 / PHASE

Tap EDIT to enter its pages; tap again to cycle to EDIT 1

Phase-distortion oscillators.

Knob / label	What it does
K1 · WAVE	First waveform
K2 · WAVE2	Second waveform
K3 · DCW	Phase-distortion amount
K4 · ENV	Envelope influence on distortion

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 1 / LOFI

Tap EDIT to enter its pages; tap again to cycle to EDIT 1

Chip-style tone generation.

Knob / label	What it does
K1 · CHIP	Chip model
K2 · WAVE	Waveform
K3 · DUTY	Pulse duty cycle
K4 · CRSH	Bit crushing

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 1 / SAMPLE

Tap EDIT to enter its pages; tap again to cycle to EDIT 1

Sample playback setup.

Knob / label	What it does
K1 · SET	Sample set
K2 · TUNE	Pitch tuning
K3 · BITS	Bit depth
K4 · LOOP	Loop mode

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 1 / VOICE

Tap EDIT to enter its pages; tap again to cycle to EDIT 1

Vowel/formant synthesis.

Knob / label	What it does
K1 · VOWL	First vowel
K2 · VOWL2	Second vowel
K3 · TALK	Blend/talk between vowels
K4 · SHIFT	Formant shift

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 1 / TRIO

Tap EDIT to enter its pages; tap again to cycle to EDIT 1

Three-oscillator intervals.

Knob / label	What it does
K1 · WAVE	Waveform
K2 · INT2	Second oscillator interval
K3 · INT3	Third oscillator interval
K4 · DTN	Detune

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 1 / WHEEL

Tap EDIT to enter its pages; tap again to cycle to EDIT 1

Tonewheel harmonic registration.

Knob / label	What it does
K1 · REG	Drawbar registration
K2 · SUB	Low/sub harmonics
K3 · BODY	Middle/body harmonics
K4 · TOP	Upper harmonics

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 1 / GRAIN

Tap EDIT to enter its pages; tap again to cycle to EDIT 1

Granular playback source and timing.

Knob / label	What it does
K1 · SRC	Source
K2 · POS	Position within source
K3 · SIZE	Grain size
K4 · DENS	Grain density

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 1 / PHYS

Tap EDIT to enter its pages; tap again to cycle to EDIT 1

Physical-modelled resonator.

Knob / label	What it does
K1 · MODEL	Model
K2 · STRC	Structure/inharmonicity
K3 · BRIT	Brightness
K4 · DAMP	Damping

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 1 / DRUM

Tap EDIT to enter its pages; tap again to cycle to EDIT 1

Electronic drum kit character.

Knob / label	What it does
K1 · KIT	Kit
K2 · TUNE	Overall tuning
K3 · TONE	Tone
K4 · DECY	Decay

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 1 / NOISE

Tap EDIT to enter its pages; tap again to cycle to EDIT 1

Filtered noise generator.

Knob / label	What it does
K1 · MODE	Noise mode
K2 · COLR	Noise colour
K3 · FREQ	Filter frequency
K4 · RES	Resonance

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 1 / FM6

Tap EDIT to enter its pages; tap again to cycle to EDIT 1

Six-operator FM macro controls.

Knob / label	What it does
K1 · ALG	Algorithm/routing
K2 · FB	Feedback offset
K3 · MLVL	Modulator level offset
K4 · MRAT	Modulator ratio offset

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 1 / SLICE

Tap EDIT to enter its pages; tap again to cycle to EDIT 1

Sliced sample playback.

Knob / label	What it does
K1 · SRC	Sample source
K2 · DIV	Slice division
K3 · START	Start offset
K4 · PTCH	Pitch

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 2 / ANALOG

Tap EDIT to enter its pages; tap again to cycle to EDIT 2

Filter and drive.

Knob / label	What it does
K1 · CUT	Filter cutoff
K2 · RES	Resonance
K3 · DRV	Saturation drive
K4 · KTR	Filter key tracking

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 2 / PHASE

Tap EDIT to enter its pages; tap again to cycle to EDIT 2

Shape the oscillator combination.

Knob / label	What it does
K1 · DTN	Detune
K2 · LINE	Mix or ring-modulate the two lines
K3 · SUB	Sub-oscillator level
K4 · FOLD	Wavefolding amount

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 2 / LOFI

Tap EDIT to enter its pages; tap again to cycle to EDIT 2

Retro movement and tone.

Knob / label	What it does
K1 · SWP	Pitch sweep
K2 · VIB	Vibrato amount
K3 · ARP	Chip arpeggio
K4 · TONE	Tone/brightness

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 2 / SAMPLE

Tap EDIT to enter its pages; tap again to cycle to EDIT 2

Sample colour.

Knob / label	What it does
K1 · CUT	Low-pass cutoff
K2 · —	Unused
K3 · DRV	Drive
K4 · —	Unused

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 2 / VOICE

Tap EDIT to enter its pages; tap again to cycle to EDIT 2

Voice texture.

Knob / label	What it does
K1 · BUZZ	Buzz amount
K2 · BRTH	Breath/noise amount
K3 · Q	Formant resonance
K4 · RAND	Random variation

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 2 / TRIO

Tap EDIT to enter its pages; tap again to cycle to EDIT 2

Oscillator combination and filter.

Knob / label	What it does
K1 · MODE	Combination mode
K2 · CUT	Filter cutoff
K3 · RES	Resonance
K4 · PW	Pulse width

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 2 / WHEEL

Tap EDIT to enter its pages; tap again to cycle to EDIT 2

Organ articulation and movement.

Knob / label	What it does
K1 · PERC	Percussion setting
K2 · CLICK	Key-click amount
K3 · DRV	Drive
K4 · ROTR	Rotary mode/speed

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 2 / GRAIN

Tap EDIT to enter its pages; tap again to cycle to EDIT 2

Granular pitch and texture.

Knob / label	What it does
K1 · PTCH	Pitch
K2 · SPRD	Grain spread
K3 · RAND	Random variation
K4 · TONE	Tone

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 2 / PHYS

Tap EDIT to enter its pages; tap again to cycle to EDIT 2

Excitation and articulation.

Knob / label	What it does
K1 · POS	Excitation/pluck position
K2 · ACC	Accent response
K3 · BOW	Bowed excitation amount
K4 · EXC	Direct exciter amount mixed into output

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 2 / DRUM

Tap EDIT to enter its pages; tap again to cycle to EDIT 2

Drum transient and drive.

Knob / label	What it does
K1 · SNAP	Snap
K2 · ACC	Accent strength
K3 · KICK	Kick character
K4 · DRV	Drive

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 2 / NOISE

Tap EDIT to enter its pages; tap again to cycle to EDIT 2

Noise movement and texture.

Knob / label	What it does
K1 · TRK	Pitch/key tracking
K2 · DENS	Density
K3 · DRFT	Slow drift
K4 · CRSH	Crushing amount

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 2 / FM6

Tap EDIT to enter its pages; tap again to cycle to EDIT 2

FM response and source patch.

Knob / label	What it does
K1 · MEG	Modulator envelope-rate offset
K2 · VMOD	Velocity-to-modulation sensitivity
K3 · DTUN	Detune
K4 · SLOT	FM patch slot

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

EDIT 2 / SLICE

Tap EDIT to enter its pages; tap again to cycle to EDIT 2

Slice articulation.

Knob / label	What it does
K1 · MODE	Playback mode
K2 · REV	Reverse
K3 · DCAY	Decay
K4 · TONE	Tone

These controls depend on the selected engine. Choose the engine by holding EDIT outside the stopped STEP editor. Change one control while playing to hear its effect.

FILTER

Tap EDIT to enter its pages; tap again to cycle to FILTER

Choose the analogue engine’s filter response.

Knob / label	What it does
K1 · TYPE	Filter type
K2 · CUT	Cutoff: lower is darker
K3 · RES	Resonance near the cutoff
K4 · KTR	How much cutoff follows note pitch

LANES

Tap EDIT to enter its pages; tap again to cycle to LANES

Balance the first four drum lanes.

Knob / label	What it does
K1 · KICK	Kick level
K2 · SNARE	Snare level
K3 · CLAP	Clap level
K4 · HATCL	Closed hi-hat level

LANES 2

Tap EDIT to enter its pages; tap again to cycle to LANES 2

Balance the other four drum lanes.

Knob / label	What it does
K1 · HATOP	Open hi-hat level
K2 · TOM	Tom level
K3 · RIM	Rim level
K4 · BELL	Bell level

SLICES

Tap EDIT to enter its pages; tap again to cycle to SLICES

Trim and split an uploaded sample into playable slices.

Knob / label	What it does
K1 · SLICE	Select slice marker, or END
K2 · POS	Move the selected marker
K3 · SPLIT	Select SPLIT action
K4 · JOIN	Select JOIN action

Turn an action knob then OCT+ to apply; OCT− cancels. Editing requires a populated user sample slot. Factory sources are view-only. Keys select and audition slices.

OPERATOR

Tap EDIT to enter its pages; tap again to cycle to OPERATOR

Edit one of the six FM operators: an oscillator that may make sound or modulate another.

Knob / label	What it does
K1 · OP	Select operator
K2 · RATIO	Coarse frequency ratio (or fixed-frequency setting)
K3 · FINE	Fine frequency adjustment
K4 · LEVEL	Operator output level

Changing a carrier level changes loudness; changing a modulator level mainly changes brightness. The algorithm shows how operators connect.

OP ENV

Tap EDIT to enter its pages; tap again to cycle to OP ENV

Shape the selected FM operator over time.

Knob / label	What it does
K1 · OP	Select operator
K2 · STAGE	Select envelope stage
K3 · RATE	Rate for that stage
K4 · LEVEL	Target level for that stage

This is an operator envelope, separate from the whole-instrument ENV page. Higher rate means faster movement.

OPERATOR 2

Tap EDIT to enter its pages; tap again to cycle to OPERATOR 2

Set the selected FM operator’s tuning and touch response.

Knob / label	What it does
K1 · OP	Select operator
K2 · MODE	Ratio or fixed-frequency mode
K3 · DTUN	Operator detune
K4 · VEL	Velocity sensitivity

VOICE

Tap EDIT to enter its pages; tap again to cycle to VOICE

Choose how notes share voices and slide between pitches.

Knob / label	What it does
K1 · VCE	POLY, MONO, LEGATO or UNISON
K2 · GLD	Glide time
K3 · GLMOD	Glide behaviour
K4 · PRIO	Mono note priority

One-key chords need POLY. All four tracks share eight voices; long four-note chords can steal voices from other parts.

VOICE 2

Tap EDIT to enter its pages; tap again to cycle to VOICE 2

Control voice allocation and the selected track’s placement.

Knob / label	What it does
K1 · ALLOC	Voice allocation policy
K2 · DTUNE	Unison detune
K3 · PAN	Track pan
K4 · MUTE	Track mute

VOICE 3

Tap EDIT to enter its pages; tap again to cycle to VOICE 3

Spread unison voices across the stereo field.

Knob / label	What it does
K1 · SPRD	Stereo spread
K2 · —	Unused
K3 · —	Unused
K4 · —	Unused

SONG

Tap GLO to enter its pages; tap again to cycle to SONG

Arrange saved patterns into a complete four-track performance.

Knob / label	What it does
K1 · SECTION	Select section, or + ADD
K2 · TRACK	Select track cell
K3 · PATTERN	Choose pattern source A–D or MUTE; on + ADD create a section
K4 · LOOPS	Number of repetitions, 1–16

First save variations in PROJECT slots A–D. Each arrangement row chooses a source for each track, using the current sounds. PLAY here starts the arrangement and stops at its end. Up to 16 sections. A loop follows the first unmuted track’s pattern length, not necessarily one bar. Stop playback before editing and save the project again to keep the arrangement.

SOUNDS

Tap SAVE to enter its pages; tap again to cycle to SOUNDS

Save or recall one instrument sound.

Knob / label	What it does
K1 · SLOT	Choose user slot
K2 · LOAD	Select LOAD action
K3 · ERASE	Select ERASE action
K4 · SAVE	Select SAVE action

Turn the action knob, then OCT+ and follow the confirmation/name prompts; OCT− cancels. Stop to save. Loading a sound preserves the current beat and the track’s scale/chord settings. Use PROJECT to save the whole session including chords.

PRESETS

Tap SAVE to enter its pages; tap again to cycle to PRESETS

Browse factory and saved sounds.

Knob / label	What it does
K1 · No.	Choose a preset
K2 · ENG	Choose a preset
K3 · FAV	Favourite control
K4 · LIST	Choose list/category

PRESETS also browses. All standard browsing stays in the approved REGGAE-OS bank plus your saved sounds.

PHRASES

Tap SAVE to enter its pages; tap again to cycle to PHRASES

Load an existing phrase into the selected track.

Knob / label	What it does
K1 · PAT	Choose phrase
K2 · LOAD	Select LOAD action
K3 · —	Unused
K4 · —	Unused

Confirm LOAD with OCT+. This replaces the selected track’s pattern; save a project first if you want to keep it.

PROJECT

Tap SAVE to enter its pages; tap again to cycle to PROJECT

Keep all four parts, sounds, chord settings and arrangement together.

Knob / label	What it does
K1 · SLOT	Choose project slot A–D
K2 · ERASE	Select ERASE action
K3 · LOAD	Select LOAD action
K4 · SAVE	Select SAVE action

Turn the action knob then OCT+; follow overwrite/name prompts. OCT− cancels. Stop playback before saving. Slots A–D are also the arrangement’s pattern sources. Changing to an occupied slot selects LOAD; press OCT+ to actually recall it. Slot selection alone leaves the current beat unchanged. Confirmation messages identify the saved/loaded slot.

TOOLS

Tap SAVE to enter its pages; tap again to cycle to TOOLS

Clear or initialise parts of a project.

Knob / label	What it does
K1 · PAT	Clear selected track’s pattern
K2 · SOUND	Initialise selected track’s sound
K3 · SEC	Remove arrangement section
K4 · SONG	Clear arrangement

Select an action and read its confirmation before OCT+. OCT− cancels. Hold SAVE to undo supported edits.

ARP

Tap ARP to enter its pages; tap again to cycle to ARP

Turn held notes into a repeating arpeggio.

Knob / label	What it does
K1 · MODE	Arpeggio mode; OFF disables it
K2 · RATE	Note rate
K3 · OCT	Octave range
K4 · GATE	Note gate length

Hold a chord and press PLAY if required by the clock/transport setup. Use short gates for separated notes.

ARP 2

Tap ARP to enter its pages; tap again to cycle to ARP 2

Add variation to the arpeggio.

Knob / label	What it does
K1 · SWG	Swing
K2 · PROB	Probability of playing a note
K3 · HOLD	Latch/hold notes after key release
K4 · ORD	Note order

STEP

Tap SEQ to enter its pages; tap again to cycle to STEP

Write notes and chords into a pattern, one step at a time.

Knob / label	What it does
K1 · STEP	Choose step
K2 · NOTE	Pitch of the selected note
K3 · LENGTH	Note duration; TIME when selecting REST/TIE
K4 · FEEL	Normal, accent or slide feel

Stopped: hold EDIT and play keys to add notes; hold REC and play keys to replace them. Hold EDIT+REC to clear one step. Hold EDIT, then SEQ for one second to clear the entire roll. Hold SAVE to undo. Tap REC to arm step entry; PLAY starts/stops playback. Up to four notes per step and 64 steps per track.

DETAIL

Tap SEQ to enter its pages; tap again to cycle to DETAIL

Add variation to the selected sequencer step.

Knob / label	What it does
K1 · CHANCE	Play probability, then conditional triggers above 100%
K2 · RATCH	Number of repeated hits within the step
K3 · NUDGE	Timing offset (requires quantisation OFF to hear)
K4 · VEL	Step velocity

PRESETS selects the step. Accent can override the velocity; ratchets and quantisation can override nudge. The screen shows these conditions.

AUTOMATION

Tap SEQ to enter its pages; tap again to cycle to AUTOMATION

Edit per-step locks and recorded parameter movement.

Knob / label	What it does
K1 · ROW	Select row
K2 · EVENT	Select/move event’s step (where applicable)
K3 · LOCK	Select parameter/type (where applicable)
K4 · PLAY	Edit row value; PLAY row toggles automation

Labels change with the row. + ADD: choose step/type, then OCT+ to add. On a record OCT+ switches LOCK (one step) and AUTO (until changed). EDIT deletes/reset the row. QUANTIZE row K4 enables/disables timing quantisation; PLAY row OCT+ asks to clear automation. The four tracks share 128 automation records.

MIXER

Tap HOME to enter its pages; tap again to cycle to MIXER

Mix all four tracks from one persistent page.

Knob / label	What it does
K1 · LEVEL	Track 1 level
K2 · LEVEL	Track 2 level
K3 · LEVEL	Track 3 level
K4 · LEVEL	Track 4 level

C5 selects LEVEL, D5 PAN, E5 REVERB: all four knobs then edit that property for T1–T4. Vertical faders always show volume. First four black keys toggle mute; hold F3/G3/A3/B3 to solo T1/T2/T3/T4. No held button is needed to stay here.

CLOCK

Tap HOME to enter its pages; tap again to cycle to CLOCK

Set the shared transport timing.

Knob / label	What it does
K1 · BPM	Tempo in BPM
K2 · SWG	Global swing
K3 · CLK	Internal or external clock source
K4 · —	Unused

Use internal clock for standalone play. External clock requires a source sending MIDI clock/transport.

VELOCITY

Tap HOME to enter its pages; tap again to cycle to VELOCITY

Set the velocity of one chord note or drum sound on a step.

Knob / label	What it does
K1 · STEP	Select step
K2 · NOTE	Select chord note or drum sound
K3 · LENGTH	Velocity of the selected note, 1–127
K4 · FEEL	Left: inherit STEP velocity/accent; right: explicit NOTE velocity

Tap SEQ until NOTE VELOCITY. K1 selects the step, K2 the note, K3 its velocity. The highlighted bar shows your selection. NOTE overrides the step accent; STEP restores the original behaviour. Save through PROJECT. Individual edits share the 128-entry automation/lock pool across all tracks; a full-pool message refuses new edits without deleting existing ones. Projects with these edits require UI 0.7.3 or later.

PUNCH-IN

Tap HOME to enter its pages; tap again to cycle to PUNCH-IN

Perform momentary dub effects without holding FX.

Knob / label	What it does
K1 · FILTER	Low/high-pass filter sweep
K2 · CRUSH	Crushing amount
K3 · THROW	Delay throw amount
K4 · DEPTH	Punch-in depth

Tap FX through its pages to PUNCH-IN. The page stays open. White keys trigger effects; black keys mute tracks. Tap FX again for the next page, or another page button to leave. Holding FX also opens this page and it stays after release.

RIDDIM GRID

SEQ with a DRUM track selected

Program eight drum lanes in the pattern.

Knob / label	What it does
K1 · STEP	Step
K2 · DRUM	Drum lane
K3 · HIT	Hit on/off
K4 · ACCENT	Accent on/off

Use PLAY to audition the loop. The grid replaces the melodic roll for the DRUM engine.

MIXER / PAN

HOME → MIXER, then D5

Place each track left or right.

Knob / label	What it does
K1 · PAN	Track 1 pan
K2 · PAN	Track 2 pan
K3 · PAN	Track 3 pan
K4 · PAN	Track 4 pan

C5 returns the knobs to volume; E5 switches them to reverb sends.

MIXER / REVERB

HOME → MIXER, then E5

Send each track to the shared reverb.

Knob / label	What it does
K1 · REVERB	Track 1 reverb send
K2 · REVERB	Track 2 reverb send
K3 · REVERB	Track 3 reverb send
K4 · REVERB	Track 4 reverb send

C5 returns to volume; D5 switches to pan. Set the reverb character on FX → REVERB.

ENGINE WORKSHOP

Hold EDIT outside the stopped melodic STEP page

Select an engine and its factory sound.

Knob / label	What it does
K1 · ENG	Engine
K2 · No.	Preset number
K3 · FAV	Favourite control
K4 · —	Unused

On stopped STEP, hold EDIT is deliberately reserved for adding notes.

SCALE GARDEN

Hold SCL

Set the chord keyboard without leaving your current page.

Knob / label	What it does
K1 · ROOT	Key/root
K2 · SCL	Scale
K3 · CHRD	Chord type
K4 · VOIC	Voicing

Release SCL to return. The normal CHORD page offers the same four controls without holding.

RECORD DESK

Hold REC outside the stopped melodic STEP page

Prepare the metronome and recording lead-in.

Knob / label	What it does
K1 · CLICK	Metronome: OFF / REC / ON
K2 · COUNT	Count-in length
K3 · LEVEL	Click level
K4 · —	Unused

Release REC to return. On stopped STEP, hold REC and keys replaces notes instead.

PATTERN TOOLS

Hold SEQ

Change pattern length and timing, or use the keyboard tools.

Knob / label	What it does
K1 · LEN	Pattern length
K2 · DIV	Step division/rate
K3 · SWG	Pattern swing
K4 · GATE	Pattern gate length

F4 opens Euclid. Read the on-screen key map before using clear/random tools; hold SAVE afterwards to undo.

EUCLID

Hold SEQ, then F4

Distribute hits evenly across a cycle.

Knob / label	What it does
K1 · HITS	Number of hits
K2 · STEPS	Number of steps
K3 · ROT	Rotate the rhythm
K4 · —	Unused on melodic tracks; drum lane on DRUM

OCT+ applies; OCT− cancels. The preview is not committed until applied.

DUB PUNCH-IN

Hold FX

Perform momentary dub effects over the playing mix.

Knob / label	What it does
K1 · FILTER	Low/high-pass filter sweep
K2 · CRUSH	Crushing amount
K3 · THROW	Delay throw amount
K4 · DEPTH	Punch-in effect depth; shimmer amount for harmonic effects

White keys F3/G3/A3: repeat 1/8, 1/16, 1/32; B3 reverse; C4/D4 low/high-pass; E4 tape stop; F4 freeze; G4/A4 octave up/down; B4 flanger; C5 phaser; D5 reverb throw; E5 echo throw; F5 gate; G5 mono. Release the key to end the effect; tails can continue. Releasing FX leaves this page open. Tap FX to continue through the effects pages. FX LATCH in settings changes release behaviour.

HELD MIXER

Hold GLO (optional shortcut)

Adjust the four track volumes temporarily.

Knob / label	What it does
K1 · LEVEL	Track 1 level
K2 · LEVEL	Track 2 level
K3 · LEVEL	Track 3 level
K4 · LEVEL	Track 4 level

Use HOME → MIXER for the persistent page with pan and reverb.

DISPLAY

Hold HOME, then ALGORITHM chooses the tab

System settings: display.

Knob / label	What it does
K1 · VALUE	Change the selected row’s value
K2 · VALUE	Change the selected row’s value
K3 · VALUE	Change the selected row’s value
K4 · VALUE	Change the selected row’s value

PRESETS selects the row; all four knobs edit that same selected row, not four different rows. OCT−/+ also decrease/increase values. OCT+ opens action rows. HOME exits. COLOR: stored palette preference; the new REGGAE artwork keeps its own palette. STYLE: filled or outlined controls. LARGE: expanded parameter feedback while editing. ANIM: ON, OFF, or idle animation. LEDS: key-light mode. SCREEN OFF: idle timeout. SCOPE: output or pre-master mix measurement. HOME: legacy scope/tracks/levels preference; curated reggae sounds use their own performance screens.

CONTROL

Hold HOME, then ALGORITHM chooses the tab

System settings: control.

Knob / label	What it does
K1 · VALUE	Change the selected row’s value
K2 · VALUE	Change the selected row’s value
K3 · VALUE	Change the selected row’s value
K4 · VALUE	Change the selected row’s value

PRESETS selects the row; all four knobs edit that same selected row, not four different rows. OCT−/+ also decrease/increase values. OCT+ opens action rows. HOME exits. HOLD: time before a button opens its held layer. KNOB ACCEL: faster turns make larger changes. FX LATCH: keep punch-in effects latched. BPM LOCK: restrict accidental SELECT tempo edits. SCALE LEDS: show notes in the scale. STEP PREVIEW: audition the selected step. CHORD ENTRY: HOLD or ADD note-entry behaviour. SELECT: choose BPM, PAGE, modulation wheel or velocity for the SELECT encoder.

AUDIO

Hold HOME, then ALGORITHM chooses the tab

System settings: audio.

Knob / label	What it does
K1 · VALUE	Change the selected row’s value
K2 · VALUE	Change the selected row’s value
K3 · VALUE	Change the selected row’s value
K4 · VALUE	Change the selected row’s value

PRESETS selects the row; all four knobs edit that same selected row, not four different rows. OCT−/+ also decrease/increase values. OCT+ opens action rows. HOME exits. SPEAKER EQ: FLAT, LOWCUT or BASS+; this also affects line/headphone and USB output. USB LEVEL: follow MASTER or fixed level. CLICK: OFF, recording-only or ON. CLICK LEVEL: metronome volume. COUNT-IN: OFF, one or two bars. TUNE: master tuning offset in cents, saved with the project.

MIDI

Hold HOME, then ALGORITHM chooses the tab

System settings: midi.

Knob / label	What it does
K1 · VALUE	Change the selected row’s value
K2 · VALUE	Change the selected row’s value
K3 · VALUE	Change the selected row’s value
K4 · VALUE	Change the selected row’s value

PRESETS selects the row; all four knobs edit that same selected row, not four different rows. OCT−/+ also decrease/increase values. OCT+ opens action rows. HOME exits. MIDI IN: input routing mode. T1–T4 CHANNEL: channels when using TRACK routing. AUTO SELECT: incoming notes can select their track. SCREEN WAKE: panel-only or panel plus MIDI. LEARN CLEAR: OCT+ immediately removes learned CC mappings. Channel/routing choices belong to the project.

SYSTEM

Hold HOME, then ALGORITHM chooses the tab

System settings: system.

Knob / label	What it does
K1 · VALUE	Change the selected row’s value
K2 · VALUE	Change the selected row’s value
K3 · VALUE	Change the selected row’s value
K4 · VALUE	Change the selected row’s value

PRESETS selects the row; all four knobs edit that same selected row, not four different rows. OCT−/+ also decrease/increase values. OCT+ opens action rows. HOME exits. USB SERIAL: developer-console interface. RESTORE LAST: restore/autosave the previous session. HELP: on-screen hints. 2ND CORE: hardware-only beta option when included in the build. CALIBRATION: control setup. INFO: runtime/version readings. ABOUT: credits. Use OCT+ to open action rows; HOME closes settings.

LABEL CREDITS

Hold HOME → SYSTEM → ABOUT → OCT+

Read project and upstream attributions.

Knob / label	What it does
K1 · --	Unused
K2 · --	Unused
K3 · --	Unused
K4 · --	Unused

PRESETS scrolls; OCT− returns to settings; HOME exits.

SYSTEM METERS

Hold HOME → SYSTEM → INFO → OCT+

Inspect firmware identity and runtime readings.

Knob / label	What it does
K1 · --	Unused
K2 · --	Unused
K3 · --	Unused
K4 · --	Unused

OCT− returns to settings. Emulator CPU readings do not establish physical FM-1 performance.

LABEL PRESS

SAVE → USER or PROJECT → SAVE → OCT+

Name the sound or project before writing it.

Knob / label	What it does
K1 · CURSOR	Cursor position
K2 · CHARACTER	Character at cursor
K3 · CATEGORY / RANDOM	Sound category for USER; random name for PROJECT
K4 · --	Unused

White keys type letters; repeated taps cycle a letter group. Black F# moves left, G# inserts space, A# moves right, C# deletes, D# switches letters/numbers. OCT+ writes, OCT− cancels. Maximum 12 characters; stop transport to save.

CONFIRMATION

After selecting an action that asks for confirmation

Check the exact operation before applying it.

Knob / label	What it does
K1 · --	Unused
K2 · --	Unused
K3 · --	Unused
K4 · --	Unused

OCT+ confirms; OCT− cancels. Read the action and track/slot in the message.

UPDATE COUNTDOWN

Firmware-update shortcut: hold both OCT buttons

Countdown before entering the device update path.

Knob / label	What it does
K1 · --	Unused
K2 · --	Unused
K3 · --	Unused
K4 · --	Unused

Release the OCT buttons to cancel. This is not needed for normal music-making. See HARDWARE.md before flashing a physical FM-1; hardware installation has not been tested for REGGAE-OS.

COUNT-IN

Start armed recording with a configured count-in

Shows the lead-in beats before recording starts.

Knob / label	What it does
K1 · --	No count-in-specific assignment
K2 · --	No count-in-specific assignment
K3 · --	No count-in-specific assignment
K4 · --	No count-in-specific assignment

PLAY stops/cancels. Set count-in length using held REC or Settings → AUDIO.

CALIBRATION

Hold HOME → SYSTEM → CALIBRATION → OCT+

Assign/check the physical controls.

Knob / label	What it does
K1 · PROMPT	Follow the named control prompt
K2 · PROMPT	Follow the named control prompt
K3 · PROMPT	Follow the named control prompt
K4 · PROMPT	Follow the named control prompt

Only operate the control named on the screen; any piano key cancels. This is device setup, not a musical edit page.