Les

FM-1 firmware · v0.1.0

BOP-1

A music toy for children that grows into a real synth: nothing sounds wrong, and every knob changes an on-screen friend.

Made by
devrvega
Released
October 18, 2026
Install
On GitHub
Scan
Scanned, nothing harmful found · Oct 31 What we checked
Last checked
October 31, 2026

What BOP-1 does

  • Music plays the moment you switch on, and the white keys stay in a pentatonic scale so nothing sounds wrong.
  • Eight friends cover sine, flute, saw lead, square robot, bass, bell, resonant pluck and noise, each drawn as a character.
  • The Lab gives two oscillators, a low, band and high pass filter, envelope, LFO, arpeggiator, glide, echo, reverb and bit-crush.
  • REC is Loop me: what you play on keys and pads goes round over the song in time.
  • Make records four layers of Beats, Bass, Tune and Sparkle into parts A B C D, chained into a song.
  • SAVE keeps the song in eight places, stores Lab sounds as My Friends, and the playing song returns after switching off.
  • USB and TRS MIDI input play the friend and the drum pads, with clock in or out and keys sent to a computer.

Its modes

Play
Press white keys to sing in the scale and black keys for drums while a song plays along.
Make
Build a song from four layers, sixteen steps, and parts A B C D chained over chords.
Lab
Shape a real subtractive synth with two oscillators, filter, envelope, LFO, arpeggiator and effects.
Lessons
Work through ten short picture lessons, each with a try-it the firmware checks.
Games
Play six listening and playing games that earn stars.
The sticker book
See the friends, styles and lesson stars you have collected.
The grown-ups' page
Set which doors show, the volume cap, lights, sleep timer, MIDI and resets.

What Les checked

BOP-1 v0.1.0Scanned October 31, 2026

What we checked for

  • The file is exactly the one its author published
  • 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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