Les

FM-1 firmware · 1.0.0

SIDOU

A C64 SID music machine: two SID chips with their own character, a GoatTracker-compatible tracker, step sequencing, live play and .sid tune playback.

Made by
Denis Sablić
Released
October 29, 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 SIDOU does

  • Two SID chips play C64 sounds, with four presets and DICE, which rolls a new sound at each turn.
  • STEP builds a pattern like a drum machine on the 16 leftmost note keys, with parameter locks per step.
  • TRACKER, ORDER, INSTR and TABLE edit the same GoatTracker 2 song, and REC records the keys and the filter knobs.
  • LAB shapes one sound over five pages, and SAVE keeps it as one of sixteen USER sounds.
  • The CHIP view picks the 6581 or 8580 and a profile, and sets age, DAC, thump and bleed.
  • Three effect slots, distortion, modulation and FX, follow the chip in stereo.
  • SAVE writes the song to the device's flash, and the menu's SONG loads, names and deletes songs.
  • SIDOU's own 6502 plays PSID tunes from flash, with mute, solo, pause and stop.

Its modes

LIVE
Play the chip from the note keys with the presets, the knob row and the effect slots.
LAB
Shape one sound across five pages, OSC, ENVELOPE, FILTER, MOD and FX, and keep it as a USER sound.
CHIP
Pick the chip model and profile, set age, DAC, thump and bleed, and edit the three effect slots.
STEP
Build a pattern like a drum machine on the 16 leftmost note keys, with locks, chance, MUTATE and DICE.
TRACKER
Edit the song's patterns in GoatTracker's layout, one voice at a time.
ORDER
Edit the orderlist entries, the subtune and the restart marker.
INSTR
Select an instrument and edit its parameters and its name.
TABLE
Edit the WAVE, PULSE, FILTER and SPEED tables, with the ARP helper on the wavetable.
SCENE
Watch generative pieces, including RED MOON RITE, move to what the instrument plays.
SIDS
Browse the stored .sid tunes and play one, with NOW PLAYING showing its title, songs and voices.

What Les checked

SIDOU v1.1.0Scanned October 31, 2026

What we checked for

  • The file is exactly the one its author published
  • 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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