Pots (Analog Controls)

Oscillator A & B: Frequency (Tuning, center = sequencer pitch), Waveform (stepless from saw to square), Level (volume into the filter).

Sub A/Ex & Sub B: Adds square wave sub-oscillators one octave below Osc A/B. If an external signal is connected, Sub A/Ex controls the external audio level.

Noise: White noise.

Filter (VCF):

Cutoff: Frequency of the low-pass filter.

Resonance & Res Max: Resonance controls the emphasis, Res Max defines the upper limit (up to self-oscillation / sine wave generation).

Slope: 3-Pole (18 dB/Oct, corresponds to 303 character) or 7-Pole (42 dB/Oct, extremely steep, removes almost all highs).

High Pass: Continuously cuts the bass frequencies.

Filter Modulation:

CV Type: Normal (filter opens on high notes) or Warp (inverted/special effect).

Env Decay & Env Amount: Control the filter envelope.

Amplifier (VCA):

Accent Decay (length for accented notes) and Env Decay (length for normal notes).

Shape: Envelope (for percussive sounds) or Gate (sound remains constantly loud until the step ends).

Bass: Normal or Boost (enhances low frequencies).

Overdrive: Distortion, selectable between Normal (standard distortion) or Phase (softer, phase-shifted).

FM (Frequency Modulation): Cross-modulation between the oscillators. Turn completely to 0 for 303 acid sounds.

Patterns

Write a pattern

Pattern Edit Mode: Press BANK button (LED off).

Enter notes / Rests: Press step keys 1-16 (LED bright = Note On, LED off = Rest).

Note length (Sustain/Tie): Hold the start step and press the end step (LEDs dim).

Pitch: Hold Shift/Clear + step key, then turn the Data encoder.

Slide (Portamento): Hold a step and press the previous step. Alternatively, set Gate Length above 99% (sld) in the OLED.

Accent & Glide: Select desired step, then press ACCENT or GLIDE key.

Length (Loop): Press LOOP key on the desired last step. (Dynamic region loop: hold LOOP + press start and end step).

Time Signature: Hold TIME/COPY + turn Data encoder (3/4 or 4/4).

Copy / Paste: (Also works live while the sequencer is running!)

Copy: Hold TIME/COPY + press step.

Paste: Hold XPOSE/PASTE + press step.

Clear pattern / notes:

Individual notes: Hold Shift/Clear + press step keys.

Entire pattern: In Pattern Select mode, hold the pattern's step key + press Shift/Clear.

Advanced Step Edit Layer (OLED)

Shift/Clear + step key opens the extended parameters for that step.

Pitch Rng Hi / Lo & Prob: For random pitch variations.

Gate Length: Percentage length of the note.

Gate Prob: Probability (or e.g. "1/4" = plays only every 4th pass) that the step plays.

Ratchet Cnt / Prob: Subdivides the step into 2-9 rapid hits (retrigger/stutter).

Play a pattern

Pattern Select: Press BANK (LED on). Data encoder selects the bank, step keys 1-16 select the pattern.

Chain Patterns: Hold the first step and press the last step of the chain.

Live Accent/Glide: Hold ACCENT or GLIDE key during playback (temporary live effect for all active steps).

Live Transpose: Hold XPOSE/PASTE and turn Data encoder (-36 to +36 semitones). (Tip: double-tap XPOSE/PASTE to open the Scale/Quantize menu).

Play in Reverse: Hold Shift/Clear and press RUN.

Remix: Press REMIX key. Turn X and Y encoders to mathematically shuffle the pattern order (256 variations, original notes remain intact).

Randomize (Dice): In Pattern Edit mode, hold REMIX:

X-Encoder Click = Random pitches

Y-Encoder Click = Random gates (rhythm)

Data-Encoder Click = Random accents/glides

Shift + Remix = Randomize everything at once.

MIDI

USB & DIN MIDI: The Reissue is Class-Compliant. Sending and receiving Clock, Notes, CCs, NRPN, and Program Changes run directly via USB in Cubase.

MIDI Step-Record: Double-tap LOOP. Play notes via a MIDI keyboard/DAW (Velocity > 69 creates an Accent, legato playing creates a Slide).

SysEx Backups: Via the SysEx menu (SONG mode -> GLIDE/SYSEX key), banks/songs can be backed up and loaded via USB/DIN.

Workflows

The classic Acid Sound: Use Osc B (sawtooth or square), 3-Pole filter, no FM, no LFO, VCA Shape on Envelope. Important for the Reissue: Set the Attack value to 0 in the OLED menu under VCF Env and VCA Env.

Scale Lock: Double-tap XPOSE/PASTE to bind the pattern to a specific scale (ideal when experimenting with random pitches).

Generative Rhythms: Use the "1 in N" conditions in the OLED for gate or ratchet probabilities so that a step triggers specifically only at the end of a 4-bar loop.

Configuration

Clock / Sync Source: Switch to SONG mode -> press ACCENT/MIDI. Set Clock Source to Internal (777 is master) or MIDI (777 follows Cubase).

Display Settings: In the Global menu (accessible via the Data encoder), you can configure the automatic hiding of the menu (OLED Timeout) and the Step Edit Layer.