DUELL
MultiMorphing Bitimbral Synthesizer
by OSCILL/R
Two synths in one small box. DUELL is free, open-source firmware (GPL-3.0) for the M-VAVE FM-1, a fork of Felucca. A bitimbral synthesizer with two independent parts, playable in three modes. This is the first firmware beta: the device package, the web installer and the browser emulator.
What is in it
- LAYER: both parts combined, with balance, velocity crossfade and key split. Perfect for complex sounds and DAWless performances.
- SPLIT: dual mono. Part 1 hard left, part 2 hard right, fully isolated for use with your external effects.
- STEREO: both parts in one stereo field.
- MORPH: glide between two versions of the same patch with one fader. A smart randomizer creates new variants from your starting point.
- 2 envelopes, 2 LFOs and a mod matrix with 8 slots. Every engine has a filter.
- Ducker (sidechain from MIDI), EQ per part, ping-pong delay, and the SHIM and RESO reverbs.
- MIDI: a channel for each part, clock in, program change, bank select.
- 97 patches, 16 MULTIs (both synths in one slot) and 16 patterns.
Full list: CHANGELOG.md.
Read this before you flash
- This is a beta. It has been tried on only one FM-1, the author's. Other units are untested.
- The FM-1 has a single-bank layout and there is no known rollback. The way back to the official firmware (V15) has worked on the author's unit about three times; it is not tested elsewhere.
- You install at your own risk. No warranty (GPL-3.0). Back up first, use a data USB cable straight into the computer, and never interrupt the write.
- DUELL is not affiliated with M-VAVE. M-VAVE's firmware is not distributed here: to go back you download V15 yourself from https://www.m-vave.com/download.
- Recovery notes: docs/RECOVERY.md.
Assets
| File | What |
|---|---|
duell-0.2.4-beta.fwsc
| the device package (the installer page loads this one) |
duell-emulator-0.2.4-beta.zip
| the browser emulator (also hosted at https://oscillr.github.io/DUELL/emu/) |
SHA256SUMS
| checksums |
783bcc49b0ba02c2c105d5f2b1e6b4d96538c85ef85a900ab796d1b6f77df4f6 duell-0.2.4-beta.fwsc
7775abee8f30679331d5e09f5b5433b7525a2a1392a3ff2d3e822a8186ea87af duell-emulator-0.2.4-beta.zip
How to install
Open the installer page in Chrome or Edge on a computer: https://oscillr.github.io/DUELL/install/. Tick the checklist, save a backup, connect the FM-1, press Install and wait for Done; then unplug and replug the unit. Steps and details: docs/INSTALL.md. The page compares the file with the SHA-256 above.
Known gaps
- The backup does not include MULTIs and PATTERN slots; restore is untested.
- Very rarely a short click (a missed audio block) when switching to a very heavy multi.
- The editor in the source tree is not adapted to DUELL.
- Tested on one unit only; MIDI is not tested with many devices; dual core is off and untested.
All of it in docs/KNOWN_ISSUES.md. Bugs: the report form.