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digitone-2-modding-skill

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SUMMARY

Agent skill for developing your own Elektron Digitone II firmware mods: ColdFire C hooks, SHARC DSP code, two emulators, flashing

README.md

digitone-2-modding-skill

An agent skill (Claude Code, Codex, Cursor, … via skills.sh) for developing your own firmware mods
for the Elektron Digitone II (OS 1.11):

  • patch the ColdFire MAIN OS in C (UI, sequencer, parameters, p-locks, LFOs, screen, keys);
  • add SHARC DSP audio code (effects, per-track processing, new machines);
  • verify both in two emulators: the real OS on digikit, and a whole-DSP SHARC
    emulator included here;
  • rebuild, re-sign and flash the .syx over USB.

It packs the reverse-engineering notes (stock addresses, hook sites, the ColdFire → DSP frame, free memory), the hardware
rules that the emulators cannot see (each one once silenced a real unit), and the tools: a ColdFire mod builder, a
SHARC boot-stream block adder, a DSP kernel DSL with a bit-exact model, static hardware-rule checks, a USB flasher, and
two worked examples that pass their emulator tests.

Install

npx skills add complex-ping/digitone-2-modding-skill

Then ask your agent to set up the workspace (scripts/dn2setup.py). It checks every dependency and tells you what is
missing.

You need

  • your own copy of Elektron's Digitone II OS 1.11 .syx (not included; sha256 2af43e65…72e0);
  • Python 3.11+, dnfw (container, signing, C builds), an m68k
    GCC (gcc-m68k-linux-gnu), digikit for the ColdFire emulator; recommended
    PyPy, cffi, mido + python-rtmidi.

Details: skills/digitone-2-modding-skill/references/setup.md.

Examples

  • double_time: a ColdFire C hook. The sequencer clock runs at
    2x; checked in the ColdFire emulator (4 → 8 sixteenths in 300 blocks).
  • track_trim: a SHARC DSP mod. Track 1 is 6 dB down in the
    main mix, from a new L2 code block, a CALL hook and an fxdsl kernel; checked by an A/B render against stock (ratio
    0.5000, track 2 unchanged).

Made with this skill

Overtone: custom firmware for the Digitone II (OS 1.12) with per-track
insert effects, the THRU, SOPHIE, LOOP and MACHINEDRUM machines, envelope followers, two arpeggiators, parameter slides
and GROOVE. Ready to install: its patcher makes the build from Elektron's own OS file.

Disclaimer

Unofficial and not affiliated with or endorsed by Elektron. Elektron and Digitone are trademarks of Elektron Music
Machines. Flashing modified firmware is at your own risk. A unit can always be recovered by reflashing the stock OS over
DIN MIDI (hold [FUNC] at power-on, [TRIG 4]). Do not redistribute Elektron's firmware or modified images of it.

Licenses: MIT, except the digikit-derived files (GPL-2.0); see THIRD-PARTY.md.

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