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Roland D-110 Mods: Rosetta OS + custom samples

New firmware and your own sounds for the Roland D-110 (D110) LA synth module. Free, open source, and tested on a real D-110.

ROSETTA OS v12
Rosetta OS on GitHub Custom samples (Rosetta ROM) Owner's manual

What the OS mod adds

ArpeggiatorUp, down, random, played, Euclid patterns, ratchets, latch. Syncs to MIDI clock.
Step sequencerUp to 32 steps, step or live recording, transposed by the key you hold.
MIDI out + MIDI CC knobsArp notes go out over MIDI. CC74/71/73/72 control cutoff, resonance, attack and release live.
Wave sequencingWavestation-style: each note steps through PCM waves. Wave Scan on CC70, random wave per note.
Mod matrix4 slots: mod wheel, aftertouch, velocity, LFO, S&H to cutoff, pitch, wave, level.
Unison, mono, glide, chordsUp to 4-voice unison, legato, glide, Chord Learn and scale chords.
Vintage driftEvery note drifts in pitch and cutoff on its own, like an old analog.
LabResonance past the stock maximum and LA32 tricks Roland never let out.

All of it runs from a new menu on the front panel. Every feature above is confirmed on hardware.

Custom samples

With Rosetta ROM the D-110's wave ROMs are swapped for flash chips, so it plays your own sounds. You record on your PC, burn the chips, and play. The D-110 doesn't record by itself, but your samples sit where the factory waves were.

Rosetta ROM Studio wave editor
Rosetta ROM Studio: pick a wave, load a WAV, set the root note and loop, build the ROM images.
Rosetta ROM Studio Patch OS window
Patch OS: your own dump in, pick the patches, see every byte it changes.

How it works

  1. Read your own chips (IC19 OS EPROM, IC15 control ROM) on a programmer such as a T48. Keep the originals.
  2. Run the bake tool. It patches your dumps and writes the burn files.
  3. Burn and fit the chips. Put the originals back and it's a stock D-110 again.

Quick mod: one socketed chip (IC19) gives the live filter screen, the CC knobs and plain-word menus. Full Rosetta adds IC15 for everything else.

Community

Questions, hardware reports and ideas: join the Discord. More Rosetta OS mods: SP-808, Akai S2000, GP-16, U-110.