User Guide

OS-303 Firmware - User Manual v0.7

Most of the standard 303 sequencer functions work the same as the original or other clones, so you should be able to get started with any existing 303 sequencer tutorial.

This guide provides a quick-reference of button combos and menus specific to the OS-303 firmware.

Modes

Pattern Play

TODO

Pattern Write

TODO

Track Play / Write

You can compose chains of pattern in either Track Play or Write mode. They will only be saved in Write Mode (or if you switch to Write Mode and back after making edits).

To clear the current chain, hold CLEAR + press BACK.

To sequence a chain, hold FUNCTION and press the pattern select buttons, using A and B to switch sections as needed. Pressing one pattern key multiple times automatically adds up to 16 repeats, indicated as a 4-bit binary number by the LEDs of the C#/D#/E#/F# keys.

Config Menus

Global Config

Hold FUNCTION + press CLEAR for the global config menu. Each of the 8 pattern select keys/LEDs represents a toggle option:

1. MIDI Note Receive
2. MIDI Clock Receive
3. MIDI Note Send (not yet implemented)
4. MIDI Clock Send
5. MIDI Program Change Receive
6. MIDI Program Change Send
7. (unused)
8. (unused)

Press FUNCTION to exit.

Quantizer Menu

In either Play Mode, Hold FUNCTION + press PITCH for the quantizer menu. The 12 pitch keys/LEDs can be used to enable/disable each semitone. (The 13th key has no effect.) Pattern steps will round down to the nearest enabled pitch.

Press FUNCTION to exit.