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Firmware

FM-106

Hype: warming · 71

Port of an open-source emulation of a classic 80s polysynth.

forM-VAVE FM-1·by@PatttF

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Download Beta6

fm106.fwsc· 596 KB

GPL-3.0· PatttF/fm-106·downloads come from the creator’s GitHub releases

44 commits and 6 releases in the last year

FM-106

6-Voice Polyphonic Roland Juno-106 Synthesizer Firmware for the M-VAVE FM-1 with Dual-Core DSP Acceleration

FM-106 ports the Roland Juno-106 analog emulation engine from ultramaster_kr106 to the M-VAVE FM-1, featuring dual-core DSP acceleration adapted from Melodee, authentic 1980s Roland styling, 128 factory presets, and Roland MN3009 BBD Stereo Chorus.

firmware/src/fm106.c          <- Main synth application, panel controls, and 80s Juno-106 UI
firmware/src/fm106_engine.h   <- 6-voice polyphonic engine, dual-core job distribution
firmware/src/fm106_osc.h      <- Bandlimited PolyBLEP DCO: Saw, Pulse/PWM, Sub-Osc, Noise
firmware/src/fm106_vcf.h      <- 4-Pole IR3109 Resonant OTA Ladder Filter & 4-Position HPF
firmware/src/fm106_adsr.h     <- Authentic Juno-106 D7811G 14-bit integer ADSR envelope
firmware/src/fm106_chorus.h   <- MN3009 BBD Stereo Chorus (OFF, I, II, I+II)
firmware/src/fm106_presets.h  <- 128 Factory Juno-106 presets from original SysEx
firmware/src/platform.c       <- Plumbing (boot, dual-core init, USB, audio ISR, settings)

Features

6-Voice PolyphonyTrue 6-voice polyphonic Roland Juno-106 synthesis with dynamic voice stealing and unison mode.
Dual-Core DSPCPU0 and CPU1 concurrently render voices in parallel during the audio ISR before stereo effects mixdown.
1980s Juno-106 UISignature Roland color scheme: dark chassis, Roland red badge, Juno cyan stripe, orange slider caps, 6 voice activity LEDs, and live 27-key keyboard.
DCOBandlimited PolyBLEP Sawtooth, Variable-width Pulse with manual/LFO PWM, Sub-oscillator (-1 or -2 oct), and Noise.
VCF4-pole 24 dB/oct IR3109 / BA662 resonant OTA ladder filter with self-oscillation and OTA saturation.
HPFAuthentic 4-position high-pass filter: 0: Bass boost (+9.4 dB shelf @ 103 Hz), 1: Flat, 2: 236 Hz, 3: 754 Hz.
ADSRAuthentic NEC uPD7811G voice microprocessor 14-bit integer envelope algorithm.
BBD ChorusMN3009 analog delay line emulation with antiphase LFO modulation: OFF, Chorus I (0.39 Hz), Chorus II (0.80 Hz), and Chorus I+II (8.0 Hz vibrato).
128 Presets128 factory Juno-106 presets decoded from hardware SysEx (Groups A & B, Banks 1-8, Patches 1-8).
USB Audio & MIDIClass-compliant 16-bit 44.1/48 kHz stereo USB audio input and USB-MIDI in/out identifying as FM-106.

Panel Controls

  • Keys (27 keys): Play 6 polyphonic voices; played notes illuminate on-screen in Roland red.
  • ENC_PRESETS: Turn to browse and instantly load any of the 128 factory Juno-106 patches.
  • ENC_KNOB1..4: Direct hands-on control of the 4 sliders on the current page with live visual fader response.
  • BTN_HOME / BTN_EDIT: Cycle through parameter edit pages:
    • VCF / DCO: Cutoff Frequency, Resonance, Envelope Mod, Sub-Osc Level.
    • ENVELOPE: Attack, Decay, Sustain, Release (ADSR).
    • DCO / PWM: LFO Mod Depth, PWM Depth, Noise Level, HPF Mode.
    • LFO / ARP: LFO Rate, LFO Delay, Arp Rate, Arp Range.
  • BTN_FX: Cycle Chorus mode: OFF → I → II → I+II.
  • BTN_ENV: Quick jump to Envelope edit page.
  • BTN_LFO: Quick jump to LFO/Arp edit page.
  • BTN_SEL: Toggle VCA mode (ENV ↔ GATE).
  • BTN_OCT_DOWN / BTN_OCT_UP: Octave shift (-2 to +2 octaves).
  • BTN_ARP: Toggle Arpeggiator.

Quick Start

Build & Test on Host

Host mode runs FM-106 natively on macOS or Linux without needing hardware:

tests/run_host.sh

Outputs:

  • build/host/fm106.wav: High-quality 44.1 kHz 16-bit stereo audio render.
  • build/host/fm106-1000.png & build/host/fm106-3000.png: Exact 240x240 LCD screen captures.

Build Target Firmware

Prerequisites: Docker (running on macOS) and the JieLi toolchain / AC79 SDK:

# Single-core build:
./build.sh                                  # -> build/fm106.fwsc

# Dual-core build (CPU0 + CPU1 parallel audio):
DINGHY_DUAL_CORE=1 ./build.sh              # -> build/fm106.fwsc

Install to M-VAVE FM-1

Install over USB from the command line:

python3 tools/fm1_install.py build/fm106.fwsc

Or via WebUSB at the FM-1 Firmware Hub.

License

GPL-3.0-only. Built upon Felucca / SLOOP / Dinghy platform by Leo Kuroshita (@kurogedelic), Hügelton Instruments, and isod89. DSP models ported and adapted from Ultramaster KR-106 by Kayrock Screenprinting and Melodee by Kerem Kilic.