Dark ambient, dungeon synth and deathdream firmware for the M-VAVE FM-1: 4 tracks, 7 sound sources, real recorded choirs, tracks that play by themselves, 64-step sequencer, long tape, granular and reverb effects. Free and open source (GPL-3.0). Install via the FM-1 Firmware Hub; try it in the web emulator or edit sounds in the web editor.