Cheat sheet for the DinSync RE-303, specifically tailored to the operating system of Pixie CPU (Sonic Potions OS). The Pixie CPU massively expands the classic 303 sequencer with live features, randomization, direct length input, and MIDI functions.

Pots

Tune: Tuning of the internal oscillator. (Note: The C note is often slightly off at the far left; always tune by ear or with a tuner).

Cutoff: Cutoff frequency of the 24dB / 4-Pole cascade filter.

Resonance: Emphasizes the cutoff frequency (chirp chirp).

Env Mod: Determines how much the envelope opens the filter cutoff.

Decay: Controls the decay time of the filter envelope (has a strong effect on the "wow" sound with accents).

Accent: Determines the intensity of the programmed accents (affects volume, filter decay, and resonance simultaneously).

Waveform: Toggle switch on the back (or panel) between Sawtooth and Square.

Patterns (Pixie CPU Features)
Turn the rotary switch to Pattern Write.

Pattern Length & Time Signature (Time Mode)
Set length directly: Hold FUNCTION + Note Keys (1-8). For steps 9-16, first hold FUNCTION, then press C# (or D#) followed by the desired Note Key.

Halve/double length: FUNCTION + ACCENT (halve) / FUNCTION + SLIDE (double).

Triplets (3/4 time): Press FUNCTION + UP to toggle triplet mode on or off (the pattern then has a max of 12 steps).

Step Input (Pitch & Time separated)
Pitch Mode (Melody): Hold PITCH. Press the Note Keys to enter your melody.

Live Trick: You can enter attributes directly while pitching. For example, hold ACCENT or UP/DOWN while pressing the note key.

Time Mode (Rhythm): Hold TIME.

DOWN = Note (Step)

UP = Tie (Sustain/Slide)

ACCENT = Rest (Pause)

Copy, Paste & Clear

Copy Pattern: Press CLEAR + C# + desired Pattern Slot (1-8).

Paste Pattern: Press CLEAR + D# + target Pattern Slot.

Paste Pitch only: CLEAR + D# + PITCH + target Pattern Slot.

Paste Time only: CLEAR + D# + TIME + target Pattern Slot.

Clear Pattern: CLEAR + Pattern Slot. (Same principle: CLEAR + TIME + Pattern Slot clears only the rhythm).

Randomize (Dice)

Randomize everything: CLEAR + ACCENT

Randomize rhythm only: CLEAR + TIME + ACCENT

Randomize melody only: CLEAR + PITCH + ACCENT

Play a pattern (Performance)

(write a pattern see here)

Turn the rotary switch to Pattern Play.

Playback & Direction
Switch to normal playback mode (holding neither Pitch nor Time):

Forward (Default): UP

Reverse: DOWN

Ping-Pong (Back & Forth): DOWN then UP simultaneously/quickly.

Random (Random steps): UP then DOWN simultaneously/quickly.

Pattern Chain
Hold the first Pattern Key and then press the second (last) Pattern Key. All patterns in between will play sequentially.

Live Transpose & Manipulation

Transpose Pattern: Hold PITCH + Note Keys (for semitone steps).

Octave Up/Down: Hold PITCH + DOWN (Octave up!) / Hold PITCH + UP (Octave down).

All Accent / All Slide: Hold PITCH + ACCENT (every step is accented) or hold PITCH + SLIDE (everything slides into each other).

Configuration & MIDI

Settings Mode (MIDI Setup)
Open menu: Hold FUNCTION and press CLEAR. (To exit, press FUNCTION again).

Change MIDI In Channel:

In Settings mode, press DOWN (Octave Down).

Press C# for group 1-8 or D# for group 9-16.

Select the exact channel using the pattern keys 1-8.

MIDI Omni Mode (receives on all channels): In Settings mode, press SLIDE (LED lights up when active).

MIDI Tx (Transmit) On/Off: In Settings mode, press note E.

Bootloader (For Firmware Updates)
Knightrider Mode: Turn off the RE-303. Hold note C (first white key) and turn the device back on. The LEDs will scan back and forth, and the CPU is now waiting for SysEx firmware data via MIDI-In.