fm1-midi-processor

FM-1 MIDI Processor

FM-1 MIDI Monitor

Custom firmware that turns the M-VAVE FM-1 into a stand-alone MIDI processor: monitor, filter, remap, re-channelize and trigger MIDI without a computer.

Help guide: how every page and control works, with screen captures.
Flash the firmware: install it from desktop Chrome or Edge over USB. No software to install.

Firmware

Latest version: 0.1.0 (build a8c8fd4918ca4038, 2026-11-03 12:40 UTC)

FM1-MidiProc.fwsc: the compiled firmware package, 459,316 bytes, for use with your own flasher.
SHA-256: b75f2630e1462a3e4f512c59021cef7bd547c5daafa41e4a62f80cde20a35039
Update identity FM-1_8000014, FM1 Open SDK family 7. Details in manifest.json.

What it does

MIDI from TRS MIDI IN and USB passes through a pipeline and comes out of USB MIDI OUT:

MIDI flow: TRS and USB inputs each pass their own Channel Filter and Message Filter, then join and pass Message Remap and Channel Remap to USB MIDI OUT. Event Triggers, and the knobs and Live Keys, send straight to the output.

MIDI Monitor: a scrolling list of the last 100 messages. Colours show what the pipeline did: passed, blocked, remapped or triggered.
- Search with OP1–OP5 by port, channel, type and data ranges.
- Shortcuts turn the selected message into a rule or trigger.
Filters: per port, pass or block each channel and each message type. Channel messages are set per channel.
Remaps:
- Message rules change note, CC or program numbers and set the output channel.
- Channel rules move a port’s channel to another channel.
Rule Builder (GLO): build a remap rule by taking its input from one message and its output from another. Each can come from the monitor, the keys or the knobs.
Event Triggers: an incoming message, or a range of values, sends a list of other messages, such as bank select and program changes for a whole rig.
Knobs: KNOB 1–4 send a CC each, on the channel and CC number you choose, from any page.
Live Keys: the FM-1’s keys play notes with random velocity, and send program and bank changes.
MIDI clock:
- One input owns the clock, so clocks are never merged.
- A metronome click plays on the headphone output, with its volume on MASTER.
- The Clock Monitor shows the source, run state, BPM and elapsed time.
Patches: 16 named patches.
- Every setting can be dumped and loaded over SysEx, for backup and editing on a computer.

MIDI Connections

The DoReMidi USB MIDI Host Box can be used to provide DIN MIDI in/out ports for the FM-1. With the USB Host Box, you have 2 inputs (1 DIN and 1 TRS) and 1 DIN output. The USB Host Box will also power the FM-1.

[!NOTE] MIDI from the host box’s DIN input reaches the FM-1 over USB. So on the FM-1 it appears as the USB port (U in the monitor).

DoReMidi USB MIDI Host Box

Repository

Folder	Contents
`src/`	Firmware, built on the FM1 Open SDK
`tools/`	USB flasher (`fm1_flash.py`), patch SysEx tool, screen designer, site builder, tests
`design/`	Screen designs, design decisions, patch and SysEx format
`html/`	The help site and flash page, published with GitHub Pages

To build the firmware, you need the JieLi PI32 toolchain. Run:

set FM1_PI32_TOOLCHAIN=C:\JL\pi32
python tools\fm1_flash.py --build

fm1_flash.py --build builds the firmware and flashes it to a connected FM-1.

FM-1 MIDI Processor is unofficial firmware. It isn’t made or supported by M-VAVE. Use it at your own risk.