USB Audio 1.0 (for beta Release 1.3 on 2026-10-13)

USB Audio 1.0

Class-compliant USB audio interface capability for the Deluge. Send any track to its own channel in your DAW or other USB host, and send up to four channels back into the Deluge. No driver needed.

Based on SynthstromAudible/DelugeFirmware:main @ bfd4a0b5 (2026-10-13), the development line for community release 1.3 Derbyshire.

Features:

• 8 channels out, 4 channels in, 16-bit, 44.1 kHz, alongside USB MIDI
• Per track: send to any of 8 mono channels or 4 stereo pairs, and optionally take it out of the Deluge's own outputs
• Return to the song: one returning pair summed into the song mix, before the song's effects, with its own level
• Return to a track: an audio track can take a USB channel or pair as its input, and play and record it like a line input
• Delay compensation: holds the Deluge's own sound back 0–100 ms so a track sent through an external effect comes back in time

Controls:

Sending a track out — open a synth, audio or kit clip, press SELECT, and choose USB. Each item is an on/off switch, and any number can be on at once.

Item	What it does
1 – 8	Sends this track to that USB channel, mixed down to mono
1-2, 3-4, 5-6, 7-8	Sends this track to that pair in stereo: left on the first channel, right on the second
MAIN	On by default. Off removes the track from the Deluge's own outputs, so it is heard only through USB

Routing belongs to the track, so launching another clip on the same track keeps it. Several tracks sent to the same channel are mixed together there. A kit is routed as a whole. The routing is saved with the song.

Taking audio in on a track — on an audio track, open the input selector, choose USB, then press SELECT to pick:

Item	What it does
1 – 4	That returning channel as the track's input, in mono on both sides
1-2, 3-4	That returning pair as the track's input, in stereo

The track then plays and records the returning audio like a line input, through its own filters, effects, volume and pan. A pair used by a track is not also added to the song mix by RTN.

Settings — SETTINGS > USB. These are saved on the Deluge, not in the song.

Item	What it does
RTN	Which returning pair is mixed into the song: off, 1-2 or 3-4. It joins before the song's effects, master filter, volume and compressor, so it is treated like the Deluge's own tracks
RLVL	Level of the RTN pair, 0–50 in 1.2 dB steps. 0 is silent, 40 is unchanged, 50 is +12 dB
CMP	Delay compensation, 0–100 ms. Holds the Deluge's own tracks back by this much so a track sent out to an external effect and returned lands in time with the rest. Set it to the round-trip delay of your external setup. 0 is off

Known limits:

• While connected as a USB audio device, the Deluge cannot host a USB MIDI controller. MIDI to and from the computer still works.
• Tracks are sent dry and before the master effects and volume.
• A track taken out of the main mix still sends its reverb tail to the main outputs.
• Kits route as a whole, not per drum. MIDI and CV tracks have no USB routing.
• On a dense song, routing costs about 1.5 voices.
• The return drops about one sample a second to stay in step with the computer's clock. This is inaudible.
• With CMP on, everything you play on the Deluge is heard that much later. Line inputs are delayed too.

Tested on: 7-segment Deluge, macOS (Ableton Live, Audacity), Linux (Raspberry Pi).
Not tested on: OLED Deluge, Windows. Reports welcome.

Installation:

• Copy USB-Audio-1.0.bin to the Deluge's SD card root
• Delete any other .bin from the root
• Hold SHIFT, power on, wait ~30 seconds

To revert: put an official Deluge firmware .bin back and repeat.

This is an experimental feature in development by one person with a limited testing environment.
Please report any bugs!

AUX Sends 1.0 (for stock Release 1.2.1 Chopin)

AUX Sends 1.0

An assignable AUX send bus on the Deluge's two CV sockets. Dial a copy of any clip to CV1/CV2 independently of the main mix. No soldering needed. 7-segment Deluge only (OLED compatibility is being explored)

This is for users on the last official stock release, Release 1.2.1 "Chopin" (2025-05-12), not the main development branch.

If you're already running a main-based or beta build, use AUX Sends 1.0.1 instead.
Differences from the main-line 1.0.1:

• No CV1S/CV2S→CV1/CV2 label rename (cosmetic only — labels read CV1S/CV2S)
• Does not include the note-CV collision guard from 1.0.1. If you use classic CV/Gate output alongside a send, treat it as untested.

Features:

• Two independent send levels per clip (0–50) or one stereo send, depending on your cable config
• AUX MASTER level on mod button 7's gold knob
• Automatable, MIDI-learnable (unconfirmed)
• Per-track AUX menu, global SETTINGS > AUX

Installation:

• Copy AUX-Sends-1.0.1.bin to the Deluge's SD card root
• Delete any other .bin from the root
• Hold SHIFT, power on, wait ~30 seconds

To revert: put an official Deluge firmware .bin back and repeat.

This is an experimental feature in development by one person with a limited testing environment.
Please report any bugs!

AUX Sends 1.0.1 (for beta Release 1.3 on 2026-08-16)

AUX Sends 1.0.1

An assignable AUX send bus on the Deluge's two CV sockets. Dial a copy of any clip to CV1/CV2 independently of the main mix. No soldering needed. 7-segment Deluge only (OLED compatibility is being explored)

Based on SynthstromAudible/DelugeFirmware:main @ [685b4fb9] (2026-08-16) — i.e. the active development branch. Full source diff attached. For users on the last official stock release, Release 1.2.1 Chopin (2025-05-12), use AUX Sends 1.0 instead.

Features:

• Two independent send levels per clip (0–50) or one stereo send, depending on your cable config
• AUX MASTER level on mod button 7's gold knob
• Automatable, MIDI-learnable (unconfirmed)
• Per-track AUX menu, global SETTINGS > AUX

Installation:

• Copy AUX-Sends-1.0.1.bin to the Deluge's SD card root
• Delete any other .bin from the root
• Hold SHIFT, power on, wait ~30 seconds

To revert: put an official Deluge firmware .bin back and repeat.

This is an experimental feature in development by one person with a limited testing environment.
Please report any bugs!