Les

FM-1 firmware · 2.5

zp12

A gritty 12-bit sampling drum machine after the 80s samplers: sample into the FM-1 or the browser, then build loops and songs on 32 pads.

Made by
zvenson
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 zp12 does

  • zp12 turns the FM-1 into a 12-bit sampling drum machine with 32 pads in four banks at 26.04 kHz.
  • Pitch comes from the playback rate with no interpolation, so tuned sounds skip or repeat and the aliasing stays.
  • Each pad plays on the channel of its position: pads 1-2 have a resonant 4-pole low-pass, 3-6 a fixed one, 7-8 none.
  • The sequencer holds 16 loops of 1 to 32 bars or AUTO, 512 hits each, and four songs.
  • Record in real time with a count-in, AUTO CORRECT and swing, or hold SEQ and tap a pad's 16 steps.
  • Hold FX with white keys 1-4 for rolls, reverse and tape stop, or OCT- and OCT+ to throw everything into reverb or echo.
  • Sample on the machine over USB: the FM-1 is your computer's speaker, tap LFO, press REC and the take lands on the selected pad.
  • Sounds, mix, effects, loops and songs save themselves in flash when you stop, and the browser editor and backup page handle your own samples.

Its modes

HOME
KNOB 1-4 are the channel faders and the screen shows the selected pad and tempo.
EDIT
Set a pad's sample, TUNE, FINE, DECAY, LEVEL, start and end, CHOP group, pan, filter and effect sends.
FX
Shape the DJ filter on the mix plus chorus, tempo delay and reverb.
SEQ
Pick the loop, set its bars, AUTO CORRECT and swing, and clear or copy it.
SONG
Chain loops into four songs with a step, its loop and a repeat count.
SETUP
Set tempo, how long a page keeps the knobs, and the factory reset.
CLICK
Switch the click, choose a count-in of one or two bars, and set when an overdub starts.
OUTPUT
Turn SMOOTH on so cut sounds bridge instead of clicking.
SAMPLE
Sample into the FM-1 over USB with rate, time, threshold and monitoring.
MULTI PITCH
Play the last sound chromatically over all 27 keys.

What Les checked

zp12 2.5Scanned 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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