OP-PatchStudio is a free, open-source web app for creating custom presets for Teenage Engineering's OP devices. You import your own samples, arrange them into multisample or drum patches (with an organize mode and WAV support), and export a ready-to-load preset for the OP-XY and OP-1 family. The original project went quiet, and a maintained continuation by maxupp now lives at op-patch.studio. It reworks the multisample workflow with pitch detection and smarter filename mapping, lets you set a preset's octave, and fixes long-standing bugs. A desktop version is in the works.
