Digitone II Mods

Replace the factory FM DRUM transient bank with your own samples — 34 slots, each a short percussive hit. Drop in audio and the tool builds the combined bank and a signed firmware image for you.

Open the Transient Swapper →

Runs entirely in your browser — no install, no command line, nothing uploaded. There is a command-line version below if you prefer it.

Slots

34

Each

4,800 samples — exactly 100.0 ms at 48 kHz, 16-bit mono

Input

In the browser tool, any audio your browser can play — mixed to mono, resampled to 48 kHz and fitted to the slot for you. The command-line version takes 16-bit WAV.

Touches

Section 7 (the audio DSP image) only — no code, no lengths, no key material

Tested

Extracting the factory bank and writing it straight back produces a byte-identical image, and rebuilds pass 21 of 21 integrity checks

# hear what is in there now
dnfw mods extract firmware.syx --mod transients -o factory/

# swap in your own — sorted order, 00.wav first
dnfw mods apply firmware.syx --mod transients --from my_hits/ -o modded.syx

# --prepare onset-aligns each input to the slot and fades its end
dnfw mods apply firmware.syx --mod transients --from my_hits/ -o modded.syx --prepare

Getting a transient out of an ordinary sample

A slot is 100 ms of percussive attack, and most samples are neither. Two different problems, worth keeping apart:

• Fitting — mono, 48 kHz, 100 ms, starting at the attack rather than at whatever silence the file begins with. That is what --prepare does.
• Separating — pulling the percussive layer out of a sample that is also pitched. That is real signal processing, and transientsplit (MIT, by Mikko Vihonen) already does it: it splits a sample into transient, tonal and residual parts in your browser, with nothing uploaded anywhere.

So the route for an arbitrary sample is: run it through transientsplit, keep the transient stem, then hand that to --prepare. We link rather than bundle — it is someone else's tool, it works, and duplicating it would only make a worse copy.

Tuning it per sample

--prepare finds the attack and keeps a few milliseconds before it. One number cannot be right for every sound — a sharp click wants almost none, a soft or swelling attack wants more or the front gets cut off — so it is adjustable, and adjustable per file rather than per bank.

Drop a prepare.csv next to your samples:

# file, lead_ms, start_ms
kick.wav,    6,
snare.wav,    , 120
rim.wav,   0.5,

lead_ms adjusts the automatic guess. start_ms replaces it — the window begins exactly there, for when the part you want is not the first attack: the second hit of a flam, a tail on its own, a sample whose useful moment is 300 ms in. Files you do not list use --lead-ms, which defaults to 3.

A filename in the CSV that is not in the folder is an error, not a shrug — a typo that silently does nothing would be worse than being told.

Thirteen per-voice parameters ship closed to modulation. This opens them, so an LFO can reach SYN trig and envelope-reset, key tracking, the amp envelope delay and mode, and portamento.

Open the Destinations tool →

Runs entirely in your browser — no install, no command line, nothing uploaded.

Opens

SYN ATRG ARST BTRG BRST PHRT KSA KSB1 KSB2, Amp DEL MODE RSET, Portamento PTIM PORT

Changes

13 bytes — one per parameter, in section 3 (the control CPU)

Touches

No code, no lengths, no key material, no audio

Tested

Flashed 2026-09-12: all thirteen appear as LFO destinations and modulate

Combines

With Arpeggiator SHUF and RAND, Arpeggiator p-locks, Boot screen, LFO modulation of the FX, New LFO waveforms, Arpeggiator on MIDI tracks, Song guard, FM drum transients, Waverider, a sixth machine; in one order only with A fourth LFO (moddest must be applied first). See the compatibility table

# both mods on one image, in one command
dnfw mods apply firmware.syx --mod moddest --mod transients --from my_hits/ -o modded.syx

Stock firmware offers an LFO a hundred destinations and every one is inside the voice. This adds the machine's global effects: twenty-four Chorus, Delay and Reverb parameters in the DEST list, chosen by name, modulated per track.

Open the FX Modulation tool →

Runs entirely in your browser — no install, no command line, nothing uploaded.

Adds

Chorus DPTH SPD HPF WDTH DEL REV VOL, Delay TIME X WID FDBK HPF LPF REV VOL DEL, Reverb PRE DEC FREQ GAIN HPF LPF VOL REV

Changes

23 places in section 3 — two bounds, two hooks, seven jsr targets, ten record masks, one name pointer, and 128 bytes of new code in a free run. Nothing appended, no length changes

Global

These are the machine's one Chorus, Delay and Reverb, so every track's LFO can aim at the same one and they add up. That is what "global" means, not a fault

Tested

Flashed 2026-09-23: an LFO aimed at Delay Feedback Gain moves the feedback, responding to DEP and SPD

Combines

With Arpeggiator SHUF and RAND, Boot screen, New LFO waveforms, Arpeggiator on MIDI tracks, More modulation destinations, Song guard, FM drum transients; in one order only with A fourth LFO (fxmod must be applied first); not with Arpeggiator p-locks (both use the same code cave); Waverider, a sixth machine (waverider refuses after fxmod: 0x400dc02a (slot_to_id: saves d2, d1 = 100, a0 = slot) is not stock; this mod is for unmodified Digitone II 1.11). See the compatibility table

dnfw mods apply firmware.syx --mod fxmod -o modded.syx
# with the per-voice destinations and the new waveforms
dnfw mods apply firmware.syx --mod fxmod --mod moddest --mod lfowaves -o modded.syx

The Digitone II has three LFOs per track and an empty fourth page under [MOD]. This fills it with a fourth LFO that behaves like the other three: the same controls, the same DEST browser, the same waveforms.

Open the LFO4 tool →

Runs entirely in your browser — no install, no command line, nothing uploaded. Apply it last: build FX Modulation or Modulation Destinations first, then load their download.

Adds

A fourth page under [MOD] with its own SPD MULT FADE DEST WAVE SPH MODE DEP

Plays

Modulates on every voice, so polyphonic tracks and tracks that move between voices are modulated too

Keeps

Its settings are stored with the sound by SAVE PROJECT, and survive a power-cycle even without a save, like any stock parameter

Changes

204 places in section 3, and 23.7 KB appended to it: a start-up loader, the compiled C that runs LFO4, and a copy of the parameter table with ten new records. The table is rebuilt from your own firmware file when the mod is applied, so none of Elektron's data ships with it

Combines

With Arpeggiator SHUF and RAND, Arpeggiator p-locks, Arpeggiator on MIDI tracks, Song guard, FM drum transients; in one order only with LFO modulation of the FX (fxmod must be applied first); More modulation destinations (moddest must be applied first); not with Boot screen (both need the start-up hook and the appended area); New LFO waveforms (both need the start-up hook and the appended area); Waverider, a sixth machine (both use the same code cave). See the compatibility table

dnfw mods apply firmware.syx --mod lfo4 -o modded.syx
# with the per-voice destinations: moddest's opened masks carry into LFO4's table
dnfw mods apply firmware.syx --mod moddest --mod lfo4 -o modded.syx

Seven new LFO waveforms after RAND: a stepped staircase, a pulse with variable width, coloured noise with a loop length, a trapezoid with adjustable edges, and three wavetables. Each draws its own shape on the LFO page, and the knob that was SPH is renamed for what it does. Swap any of the three wavetables for your own WAV wavetable.

Open the LFO Waves tool →

Runs entirely in your browser — no install, no command line, nothing uploaded.

Adds

STEP (STPS), PULS (WDTH), NOIS (TYPE), TRAP (SLOP), WTB1 WTB2 WTB3 (POS)

Wavetables

Ours: basic shapes, harmonic sweep, vowels — or yours: a WAV wavetable (Serum/Vital style) or a JSON table, reduced to 7 frames of 32 points

Changes

33 small edits in section 3 and 2.7 KB of data after its end, copied to RAM at start-up

Tested

Flashed 2026-09-17: boots; all seven waves work on audio and MIDI tracks, with their shapes and labels

Combines

With Arpeggiator SHUF and RAND, Arpeggiator p-locks, LFO modulation of the FX, Arpeggiator on MIDI tracks, More modulation destinations, Song guard, FM drum transients, Waverider, a sixth machine; not with Boot screen (both need the start-up hook and the appended area); A fourth LFO (both need the start-up hook and the appended area). See the compatibility table

# ours, or replace wavetable 2 with your own
dnfw mods apply firmware.syx --mod lfowaves --wavetable 2=my_table.wav -o modded.syx

Stock firmware hides the ARPEGGIATOR on MIDI tracks. This opens the menu and plays the arp out over MIDI: trigs and held keys arpeggiate on the track's MIDI channel with the same MODE, SPD, RNG, N.LEN, LEN, step mask and note offsets a synth track uses.

Open the MIDI Arpeggiator tool →

Runs entirely in your browser — no install, no command line, nothing uploaded.

Adds

The ARPEGGIATOR menu and arp playback on MIDI tracks; arp off is stock

Changes

7 small edits and one block of new code inside section 3; nothing appended, no length changes

Tested

Flashed 2026-09-17 and captured from MIDI out: offsets, velocity, step timing, and N.LEN from 1/32 to 1/4 within a millisecond; no stuck notes

Combines

With Arpeggiator SHUF and RAND, Arpeggiator p-locks, Boot screen, LFO modulation of the FX, A fourth LFO, New LFO waveforms, More modulation destinations, Song guard, FM drum transients, Waverider, a sixth machine. See the compatibility table

dnfw mods apply firmware.syx --mod midiarp -o modded.syx
# several at once
dnfw mods apply firmware.syx --mod lfowaves --mod moddest --mod midiarp -o modded.syx

The firmware names eight arp modes and offers five. This adds two of the missing ones as real modes: SHUF plays every note in the range once per cycle, in a new order each cycle, and RAND picks a random note from the range on each step. CHRD stays hidden.

Open the Arp Modes tool →

Runs entirely in your browser — no install, no command line, nothing uploaded. A sound saved in SHUF or RAND opens with its arp OFF on stock firmware.

Adds

SHUF and RAND after CYCL in the ARPEGGIATOR MODE menu; SPD, LEN, N.LEN, the step mask and note offsets work as in the other modes

Changes

8 edits in section 3, 374 B: two code caves (352 B), the arp step's dispatch and five MODE bounds. It uses 2,320 B of unused RAM at run time; nothing appended, no length changes

Tested

Confirmed on the instrument 2026-09-26; gated in the emulator first (both modes, the MODE menu, boot)

Combines

With Arpeggiator p-locks, Boot screen, LFO modulation of the FX, A fourth LFO, New LFO waveforms, Arpeggiator on MIDI tracks, More modulation destinations, Song guard, FM drum transients, Waverider, a sixth machine. See the compatibility table

dnfw mods apply firmware.syx --mod arpmodes -o modded.syx
# with the arp on MIDI tracks
dnfw mods apply firmware.syx --mod midiarp --mod arpmodes -o modded.syx

Your own mark in the start-up animation, scattered by the intro's tunnel the way the logo is: held still, or flashing against its inverse and speeding up before it settles. Bring any picture; it is fitted to the 128 × 64 screen in your browser.

Open the Boot Screen tool →

Runs entirely in your browser — no install, no command line, nothing uploaded.

You choose

The mark (ours, or any picture, with a threshold), still or flashing with its timing, and the tunnel's density

Changes

Two hooks and 200 bytes of code in section 3, and about 2 KB of data after its end, copied up at start-up

Tested

Flashed 2026-09-17: a flashing mark built through this mod booted and played; the page and the command line produce the same bytes

Combines

With Arpeggiator SHUF and RAND, LFO modulation of the FX, Arpeggiator on MIDI tracks, More modulation destinations, Song guard, FM drum transients, Waverider, a sixth machine; in one order only with Arpeggiator p-locks (bootscreen must be applied first); not with A fourth LFO (both need the start-up hook and the appended area); New LFO waveforms (both need the start-up hook and the appended area). See the compatibility table

dnfw mods apply firmware.syx --mod bootscreen --boot-image mark.pgm --boot-invert -o modded.syx

Every LFO shape, stock and LFO Waves, drawn on the instrument's own one-bit screen and swept across the knob that shapes it. Write a formula, see it exactly as the firmware will play it, and download it as a wavetable for LFO Waves.

Open the LFO Shape Bench →