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kennethreitz
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Documents learnings from reverse-engineering factory presets: loop behavior, region fields, engine settings, drum layout, and the critical difference between sampler/multisampler types. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Synthesized instrument and drum presets for the Teenage Engineering OP-XY and OP-1, generated from PyTheory's synthesis engine.
Every sound is rendered from scratch — no samples were harmed in the making of this repo.
Quick Start
- Download the zip (~130 MB)
- Copy to your device:
| Device | What to copy | Where to put it |
|---|---|---|
| OP-XY | opxy-samples/pytheory/ |
/presets/pytheory/ |
| OP-XY | opxy-samples/pytheory-drums/ |
/presets/pytheory-drums/ |
| OP-1 / OP-1 Field | op1-samples/pytheory/*.wav |
/synth/user/ |
OP-XY users: Field Kit makes managing presets easy.
Instruments
69 multisampled instruments, each with 6 samples across the keyboard (C2, C3, C4, A4, C5, C6). Playmode, looping, and sample length are set per instrument — legato for theremin and didgeridoo, mono for winds and brass, looping for bowed strings and sustained sounds, longer samples for instruments with slow decays.
Keys piano, electric_piano, wurlitzer, pipe_organ, organ,
harpsichord, celesta, music_box
Strings violin, viola, cello, contrabass, string_ensemble
Woodwinds flute, clarinet, oboe, bassoon, saxophone,
alto_sax, tenor_sax, bari_sax
Brass trumpet, trombone, french_horn, tuba, brass_ensemble
Plucked acoustic_guitar, electric_guitar, clean_guitar,
crunch_guitar, distorted_guitar, orange_crunch,
metal_guitar, bass_guitar, upright_bass, harp,
sitar, pedal_steel, banjo, mandolin, mandola,
ukulele, koto
Mallet marimba, vibraphone, xylophone, glockenspiel,
tubular_bells, timpani, crotales, tingsha,
singing_bowl, singing_bowl_ring, kalimba, steel_drum
Synths synth_lead, synth_pad, synth_bass, acid_bass,
granular_pad, granular_texture, vocal, choir, 808_bass
Other theremin, harmonium, accordion, didgeridoo, bagpipe
Drum Kits
12 drum kits, up to 24 hits each, mapped to OP-XY drum keys 53–76.
standard 24 sounds full GM kit
latin 20 sounds congas, bongos, timbales, agogo, guiro
metal 12 sounds tight kick/snare/hat + toms & cymbals
marching 14 sounds snare, quads, 5 bass drums, crash
world 15 sounds djembe, doumbek, cajon, rainstick
tabla 7 sounds na, tin, ge, dha, tit, ke, ge_bend
dhol 6 sounds dagga, tilli, both + dholak
mridangam 4 sounds tham, nam, din, tha
djembe 3 sounds bass, tone, slap
doumbek 3 sounds dum, tek, ka
cajon 4 sounds bass, slap, tap, slap_snare
effects 6 sounds rainstick, ocean drum, wind chimes
Regenerating
pip install pytheory numpy scipy
python generate.py # instruments
python generate_drums.py # drum kits
Built with PyTheory by Kenneth Reitz.