Les

FM-1 firmware · 1.0

S1Vave

An eight-voice analog-style synth after the Roland SH-101 and S-1, with a sub-oscillator, a self-oscillating filter and hands-on controls for live tweaking.

Made by
Andrew GG
Built on
OberVave
Install
On the FM-1 Firmware Hub · source on GitHub
Scan
Scanned, nothing harmful found · Oct 31 What we checked
Last checked
October 31, 2026

What S1Vave does

  • You play an eight-voice virtual analog synth with sawtooth, pulse, sub-oscillator and pink or white noise.
  • A cascaded four-pole filter self-oscillates, tracks the keyboard and sweeps from the calibrated ADSR envelopes.
  • OSC DRAW lets you draw your own wave and OSC CHOP slices it into metallic overtones.
  • Mono, unison, poly and chord voicing modes cover leads, basses, chords and pads.
  • Each track has its own length, clock division, swing and transpose for polymeters.
  • Chorus, tempo-synced ping-pong delay and plate reverb with seven room types sit at the output.
  • Hold SEQ and use the sixteen keys for steps, and tap SAVE twice to store a sound.

Its modes

PERFORM
Tap HOME to reach cutoff, resonance, envelope depth and portamento time on the four knobs for live tweaking.
OSC CORE
Set oscillator range and balance the square, sawtooth and sub-oscillator levels.
SUB / NOISE
Choose the sub-oscillator octave type, set noise level, pick pink or white noise, and fine tune.
OSC DRAW
Draw a sixteen step or interpolated wave and set its frequency multiplier.
OSC CHOP
Dial comb slicing repetitions and overtone depth for metallic and bell-like timbres.
FILTER
Shape the four-pole cutoff and resonance with LFO depth and keyboard follow.
ENVELOPE
Set attack, decay, sustain and release on the calibrated ADSR.
LFO
Set LFO rate and waveform, switch tempo sync on, and choose normal or fast audio-rate speed.
FX MIX
Balance chorus type, delay level, reverb level and delay time in one view.
VOICE
Pick mono, unison, poly or chord voicing, portamento mode, transpose and master volume.

What Les checked

S1Vave 1.0Scanned October 31, 2026

What we checked for

  • The file matches the checksum the FM-1 Firmware Hub records for this version
  • It's the same file we saw when this release first came out
  • It opens cleanly as an FM-1 firmware, nothing damaged
  • It doesn't show up on your computer as a keyboard, mouse or other input device
  • It doesn't show up as a USB drive or network adapter
  • Its text mentions no computer command tools, like PowerShell, Terminal or a download command

What we found

  • MIDI and audio, as expected

StatusScanned, nothing harmful found

Les scans every firmware here whose file is public, and shows what it checked and what it found. A scan lowers the risk; it can't rule it out. This firmware is made by its author, not by Les or M-VAVE. Back up first, and install at your own risk. How Les scans firmware

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