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M-VAVE FM-1 Synthesizer 8-Voice Polyphonic Engine GPL-3.0 Open Source

S1Vave — 8-Voice Synth on M-VAVE FM-1

Custom 8-voice polyphonic synthesizer firmware for the M-VAVE FM-1 hardware. In-browser WebMIDI flasher, 4-pole filter, OSC DRAW/CHOP, and studio stereo FX.

🎛️ Patch Editor & Monitor 🕹️ GitHub

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Target Identity: FM-1_950 (S1Vave 1.0)
Integrity: ✓ Verified CRC-16
Size: 610 KB
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SYS_CONSOLE
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[SYS] S1Vave WebMIDI Installer Initialized.

Run Sim →

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1. USB Data Line
2. Release DAW Ports
3. Interrupted Flash Recovery

What is S1Vave?

S1Vave is an open-source custom firmware that transforms the portable M-VAVE FM-1 synthesizer hardware (JieLi AC791N 32-bit RISC core) into an advanced 8-Voice Polyphonic Synthesizer with classic analog modeling character.

Every parameter has been modeled and calibrated with high-precision DSP:

  • 8-Voice Polyphonic Engine: MONO (with legato glide/auto-portamento), UNISON (8-voice analog lead/bass stack), POLY (dynamic 8-voice polyphony), and CHORD (programmable chord memory).
  • Oscillator Core: PolyBLEP anti-aliased Sawtooth, Square with Pulse Width Modulation (PWM via manual, envelope, or LFO), and sub-oscillator modes (-2o.A 25% asymmetric pulse, -2oc square, -1oc square), plus calibrated Pink & White noise.
  • Synthesizer Innovations: OSC DRAW (16-step wavetable drawing with Step & Slope interpolation) and OSC CHOP (harmonic comb slicing with depth multiplier).
  • Cascaded 4-Pole (24 dB/oct) Filter: $20\text{ Hz} \dots 20\text{ kHz}$ calibrated cutoff curve with analog self-oscillation, key tracking, and dual filter character modes (Clean Analog Model and Warm Midnight drive).
  • Calibrated ADSR Envelopes: Exponential RC curve models measured with precision hardware response times.
  • Modulation & Studio Stereo FX: 6-waveform LFO with Fast audio-rate mode ($\sim 100\text{ Hz}$), 4-model Stereo Chorus, Tempo-Synced Ping-Pong Delay, and high-density Dattorro Plate Reverb.
  • Dual-Track 64-Step Sequencer & 64 Factory Presets: Pattern ratcheting, probability, motion recording, and 64 pre-loaded classic sound programs.

Hardware Panel Controls (M-VAVE FM-1)

The M-VAVE FM-1 hardware features 4 push-encoders (K1–K4), 8 function buttons, and 16 step keys. Tapping any button immediately reveals its control page:

Page / ButtonKNOB 1 (K1)KNOB 2 (K2)KNOB 3 (K3)KNOB 4 (K4)
HOME (PERFORM)Cutoff (FREQ) [CC 74]Resonance (RESO) [CC 71]Env Depth (ENV) [CC 24]Portamento Time [CC 5]
EDIT (OSC CORE)Range (64'..2') [CC 14]Square Level [CC 19]Saw Level [CC 20]Sub Level [CC 21]
EDIT (PWM)PWM Source [CC 16]Pulse Width / Duty [CC 15]Square Level [CC 19]Sub Octave Type [CC 22]
EDIT (SUB/NOISE)Sub Type (-2o.A, -2oc, -1oc)Noise Level [CC 23]Noise Mode (Pink/White)Fine Tune [CC 76]
EDIT (OSC DRAW)Draw Mode (Off/Step/Slope)Multiplier (1.0x–32.0x)PWM Source [CC 16]Pulse Width [CC 15]
EDIT (OSC CHOP)Chop Overtone (0–200) [CC 103]Chop Comb (1.0–32.0) [CC 104]——
EDIT (FILTER)Filter Cutoff [CC 74]Filter Resonance [CC 71]Filter LFO Depth [CC 25]Key Follow (0–100%) [CC 26]
ENV (ADSR)Attack [CC 73]Decay [CC 75]Sustain [CC 30]Release [CC 72]
ENV (TRIG/AMP)Env Trigger Mode [CC 29]Amp Mode (Gate/Env) [CC 28]PWM Source [CC 16]PWM Depth [CC 15]
LFO (CORE)LFO Rate [CC 3]Waveform [CC 12]Tempo Sync [CC 106]Fast Mode [CC 79]
FX (MIX)Chorus Mode [CC 93]Delay Level [CC 92]Reverb Level [CC 91]Delay Time [CC 90]
GLO (VOICE)Poly Mode (Mono..Chord) [CC 80]Portamento Mode [CC 31]Transpose [CC 77]Master Volume [CC 7]

Hardware Controller & Monitor (Patch Editor)

Manage and visualize your M-VAVE FM-1 (S1Vave) parameters in real time over WebMIDI:

  • Full 59-Parameter Control Surface: OSC core, PWM, sub-oscillator, OSC DRAW & CHOP, filter, ADSR, LFO, and stereo effects.
  • Sound Card Sink & Audio Pass-Through: Real-time USB audio VU metering, stereo oscilloscope, and frequency spectrum monitor.
  • Preset Management: Instant program changes, patch backup/export to JSON, patch randomize, and hardware parameter readback (CC 119).
  • Interactive Piano Roll & Sequencer: 25-key virtual keyboard with octave controls, latch/hold note, and acid arpeggiator sequencer.
🎛️ Open Hardware Controller & Monitor →

Virtual Synth Simulator (WebAssembly)

Don't have an M-VAVE FM-1 physical synthesizer? You can run and play the exact C firmware in your browser, compiled to WebAssembly:

🕹️ Launch Interactive Web Simulator →

Open Source & Licensing

  • Source Code: GitHub Repository (AndrewGG88/S1Vave)
  • License: GNU General Public License v3.0 (GPL-3.0-only)
  • Disclaimer: S1Vave is an independent community open-source project created by Andrew GG and is not affiliated with, sponsored by, or endorsed by any commercial hardware manufacturer.