__  __
    ____  __  __/ /_/ /_  ___  ____  _______  __      ____  ____  _  ____  __
   / __ \/ / / / __/ __ \/ _ \/ __ \/ ___/ / / /_____/ __ \/ __ \| |/_/ / / /
  / /_/ / /_/ / /_/ / / /  __/ /_/ / /  / /_/ /_____/ /_/ / /_/ />  </ /_/ /
 / .___/\__, /\__/_/ /_/\___/\____/_/   \__, /      \____/ .___/_/|_|\__, /
/_/    /____/                           /____/           /_/         /____/

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.

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Getting the Presets ⬇️

1. Click this link: Download ZIP (~200 MB)
2. Your browser will download a file called pytheory-opxy-main.zip
3. Double-click the zip file to unzip it (on Mac it will unzip automatically)
4. You'll see a folder called pytheory-opxy-main — that's everything

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Installing on Your OP-XY

You'll need Field Kit, a free app from Teenage Engineering for managing presets on your OP-XY.

1. Download and open Field Kit on your Mac
2. Plug your OP-XY into your Mac with a USB-C cable
3. Your OP-XY will show up in Field Kit — click on it
4. Open the presets folder on your device
5. From the pytheory-opxy-main folder you downloaded, drag these into the presets folder:
   • opxy-samples/pytheory/ — all 83 instruments
   • opxy-samples/pytheory-drums/ — all 12 drum kits
6. Done! The presets will show up on your OP-XY right away

Installing on Your OP-1 / OP-1 Field

1. Plug your OP-1 into your computer with a USB cable
2. On the OP-1, go to TE > USB Disk to enter disk mode
3. Your OP-1 will show up as a drive on your computer (like a USB stick)
4. Open the synth > user folder on the OP-1 drive
5. From the pytheory-opxy-main folder you downloaded, open op1-samples/pytheory/
6. Copy all the .wav files into the OP-1's synth/user/ folder
7. Eject the OP-1 drive and exit disk mode
8. Load the samples using the Sampler synth engine on the OP-1

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Instruments

83 multisampled instruments, each with 6 samples across the keyboard (C2, C3, C4, A4, C5, C6). Sustained instruments (strings, winds, organ, pads) loop seamlessly while you hold a key and release when you let go. Plucked and percussive instruments play through naturally.

  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

  Mellotron    mellotron, mellotron_strings, mellotron_flute,
               mellotron_choir

  Synths       synth_lead, synth_pad, synth_bass, acid_bass,
               granular_pad, granular_texture, vocal, choir, 808_bass,
               sync_lead, sync_lead_bright, analog_pad, analog_bass,
               drift_saw, drift_square, wavefold_warm, wavefold_gnarly,
               ring_mod_bell, ring_mod_metallic

  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        14 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

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For Developers

Want to regenerate the samples yourself or tweak the presets?

uv sync                           # install dependencies
uv run python generate.py                # all instruments
uv run python generate.py piano sitar    # just specific ones
uv run python generate.py --patch        # update patch.json only (no audio regen)
uv run python generate_drums.py          # all drum kits

See opxy-preset-notes.md for detailed documentation on the OP-XY preset format — what we learned about loop behavior, region fields, envelope settings, and more.

See CHANGELOG.md for what's changed.

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Built with PyTheory by Kenneth Reitz.