DigiFilter
Per-track filter modes for the Digitakt mk1 (OS 1.54) and Digitone mk1 / Digitone Keys (OS 1.44). Both machines get the same DigiFilter modes: BP, BP2, COMB, TRASH, OB4 and OB2. Latest OS only; one elemod per machine. The Filter+FX modes are a separate project/repository and are not part of this release.
| device | TYPE | modes |
|---|---|---|
| Digitakt | 8..13 | BP, BP2, COMB, TRASH, OB4, OB2 |
| Digitone | 4..9 | BP, BP2, COMB, TRASH, OB4, OB2 |
Each mode runs per voice/track and uses that voice's own FREQ, RESO and filter envelope. Stock TYPE values keep running the stock filter.
- Both machines: COMB/TRASH use HARM/DAMP on the second FLTR page's free encoders.
- OB4/OB2 use 75% of the RESO travel on both machines.
The FLTR page redraws its FREQ/RES response curve and TYPE-box icon for the new modes.
Note: Using multiple COMB / TRASH filters will slow down your machine, especially poly tracks on the Digitone. Watch and manage your levels when adjusting and/or changing filter types.
Layout
| path | contents |
|---|---|
shared/ | firmware-free DSP: SVF/comb/OB and tables |
digifilter-dt/ | Digitakt mk1 adapter, manifest, UI, DT notes |
digifilter-dn/ | Digitone mk1/Keys adapter, manifest, UI, DN notes |
docs/ | shared design notes (OB-1 model, reference mapping) |
tests/, tools/ | host/emulator checks and generators |
releases/ | prebuilt elemods and release packages |
Build
Needs the m68k cross toolchain, elekloader 0.5+, both stock OS files, and the
matching cores (core-4.0-os1.54, core-dn1-4.0-os1.44).
python tools/build_release.py \
--elekloader <elekloader checkout> \
--stock-dt <Digitakt_OS1.54.syx> \
--stock-dn <Digitone_OS1.44.syx> \
--toolchain-bin <m68k-elf bin>
The script builds the two 1.3 elemods, lints and patch-checks both, stages them
in releases/elemods/, writes local test .syx files under out/, and creates
releases/DigiFilter-1.3.zip. Override the cores with --core-dt / --core-dn
if they live elsewhere.
Install with elekloader: add your stock OS, the matching core and the elemod,
then build the custom .syx and flash it with Elektron Transfer.
Device notes
Testing
# Digitakt DSP
python tests/filter_model.py
python tests/comb_equivalence.py
python tests/ob1_table_accuracy.py
python tests/df_bench.py # needs digiemu's patched Unicorn
# Digitone: builds and runs the shared DigiFilter DSP on the host
python tests/df_bench.py # needs digiemu's patched Unicorn
See the device READMEs and docs/ob1.md for the emulator and hardware checks.
Credits
- Digital Alchemy DSP - the Digitakt DigiFilter modes and the Digitone DigiFilter port, DSP and FLTR-page drawing.
- Simon Johansson - OB4/OB2, the Oberheim OB-1 VCF model.
- x2k_77-m1 - the original Digitone port and TYPE icons.
Licence
GPL-2.0-or-later. No Elektron firmware is included or committed.