op1r
Firmware for OP-1 (original) (Teenage Engineering)
Patcher that turns the official R246 image into a custom firmware with new synth engines, tape echo, Clouds and Elements reverb ports, a quad LFO, a Euclidean sequencer, punch in/out, 6-channel USB audio and a sample editor.
by pcppcp
- Distribution
- Patches a stock file you supply
- Requires stock
- R246
- License notes
- GPL-3.0-or-later with an additional permission (GPL-3.0 section 7) allowing the program to be combined with the Teenage Engineering firmware and conveyed, provided the op1r parts stay under the GPL. The OP-1 firmware itself is not covered, and the repository contains no firmware.
- Source
- github.com https://github.com/pcppcp/op1r
- Homepage
- pcppcp.github.io https://pcppcp.github.io/op1r/web/
- synth-engine
- fx
- sequencer
- usb-audio
- usb-midi
- granular
- reverb
- delay
- lfo
- controller-mode
- ui
Description
Adds supersaw, fmbell and granular synth engines, an animated lab screen for the stock iter synth, custom FX (tape echo, a Mutable Instruments Clouds port, an Elements reverb port) usable on instruments and as master FX, a quad LFO, a Euclidean sequencer with four patterns, punch in/out at tape markers, synth and drum sample editors, a count-in, Oblique Strategies cards, a resource monitor, tape markers, USB MIDI CC control, 6-channel USB audio out and a hidden OP-Z controller mode. The patcher checks the input image against the SHA-256 of the original R246 file and refuses anything else. A browser version of the patcher is available. The repository was created on 2026-10-09 and has been releasing several numbered builds a day.
Install notes
Patch your own official R246 image (op1_246.op1) with the web patcher or the Python script and install the result like any OP-1 update. The bootloader is not modified, so the original image can be flashed back.
Version history
| Version | Date | Notes |
|---|---|---|
| op1r 26 | 2026-10-13 | Fixes a crash when the dots sequencer saves. |
| op1r 22 | 2026-10-12 | |
| op1r (initial release) | 2026-10-09 |