FM-1 firmware · 2026.10.22
CS-1
An eight-voice synth in the spirit of the Yamaha CS-80, with dual channels, filters in series, ring modulation and touch response, played over MIDI.
- Made by
- twochannels
- Released
- October 22, 2026
- 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 CS-1 does
- CS-1 plays eight voices, each two CS-80 channels with sawtooth, pulse with PWM, noise, two filters and a sine after them.
- It carries 52 factory sounds and the CS-80's 22 preset tones, paired as row I and row II.
- An auto after touch curve makes every note swell by itself, waiting, rising, holding, then falling when the key goes.
- The keys play polyphonically with velocity and pressure sensing, and SELECT acts as a ribbon that bends pitch and springs back.
- SAVE puts the whole panel into one of 32 user slots, which keep their own flash sector.
- Effects run from ring modulator and drive through chorus, tremolo, flanger and stereo delay with tape character to phaser and plate reverb.
- MIDI arrives on USB and the TRS jack, with REC learning a controller's knobs and clock syncing the delay and sub oscillator.
- A browser emulator runs the firmware itself, and Export presets writes your bank to a file.
Its modes
- TONES
- Pick each channel's tone from the two rows, see the sound's name, and set BRILL, RESO, MIX and VOLUME.
- VCF
- Set the high-pass and low-pass filters in series with their resonances.
- VCF EG
- Shape the filter envelope with IL, AL, attack and decay, drawn live as you turn.
- TOUCH
- Set how velocity and pressure push brilliance and level on that channel.
- AUTO AT
- Draw the pressure curve every note plays by itself, with DELAY, RISE, LEVEL and FALL.
- RIBBON
- Set how far and how fast the SELECT ribbon bends, or make it hold the bend.
- REVERB
- Set the plate's size, damping, shimmer and mix.
- MIDI
- Set the channel, the CC that acts as pressure, program change, and the learned bindings.
What Les checked
CS-1 2026.10.22Scanned 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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Les is independent and not affiliated with M-VAVE or the firmware authors. M-VAVE and FM-1 are trademarks of their owners.