Spleeter 4-stem models: Deezer (MIT), ONNX export huggingface.co/Best-Practice/spleeter-4stems-onnx (Apache-2.0).
onnxruntime-web 1.30.0: Microsoft (MIT).
Basic Pitch (note transcription model, basic-pitch 0.4.0): Spotify AB (Apache-2.0), models/basicpitch/LICENSE and NOTICE.
YAMNet (instrument recognition): Google LLC (Apache-2.0), ONNX export huggingface.co/audiomagic/yamnet-onnx; AudioSet labels CC BY 4.0.
alphaTab 1.8.4 (notation, tablature, Guitar Pro export): Daniel Kuschny and contributors (MPL-2.0, unmodified; source at github.com/CoderLine/alphaTab), vendor/alphatab/LICENSE.
Bravura music font: Steinberg Media Technologies (SIL Open Font License 1.1). Sonivox sound font: Sonic Network Inc. (Apache-2.0).
Beat This! (beats and bar lines): Francesco Foscarin, Jan Schlüter, Gerhard Widmer / CPJKU (MIT), github.com/CPJKU/beat_this; ONNX export by this app.
Drum classifier: weights trained for this app (tools/drum_model.py) on free one-shots, no sounds included: CC0 kits by Karoryfer Samples and Versilian Studios (Virtuosity Drums, Big Rusty Drums, Unruly Drums, Frankensnare, The Hat With The Phat, VCSL), Sonic Pi samples (CC0, from Freesound); DRSKit by DrumGizmo.org and DRSDrums (CC BY 4.0); MuldjordKit by Lars Muldjord, DrumGizmo.org (CC BY 4.0).
EP-133 protocol knowledge: kmorrill/ep-series-sysex, ZacharySBrown/ep133-ppak (MIT).
Not affiliated with teenage engineering. EP-133 and K.O. II are their trademarks.