OP-1 Tape Undo / Redo
Firmware for OP-1 (original) (Teenage Engineering)
Unofficial full OS image for the original OP-1 that adds tape undo / redo (hold TAPE and press left or right to step through up to 7 takes), bundled with op1r's synths, effects and sequencers, MIDI CC control and a scale mode.
by Maiko Pruett
- Distribution
- Prebuilt image you flash yourself
- License notes
- No license statement and no published source. Build #249 includes components from op1r, which is GPL-3.0-or-later.
- Homepage
- maikopruett.com https://maikopruett.com/op-1
- tape
- synth-engine
- fx
- sequencer
- usb-midi
- scales
- ui
Description
Undo covers recordings, punch-ins, overdubs and loop recordings, plus lift, drop, slide, split and join, with the tape stopped or playing. A popup modelled on the OP-1 Field's shows each step, history survives power off, and undo works on units with nearly full tape storage. Build #248 added the popup and snapshot naming (up to 12 characters) on a tape-reel screen. Build #249 folds in pcppcp's op1r (supersaw, FM bell and granular synths, tape, Clouds and reverb effects usable as master FX, a quad LFO, euclid and dots sequencers) and adds MIDI CC control, a scale mode and a storage bar on the COM screen. A customize page lists each component and lets you choose which to include. Not affiliated with Teenage Engineering.
Install notes
Download the prebuilt .op1 image and install it through the OP-1's update mode like an official OS. The page links Teenage Engineering's official #246 build alongside it, and warns to flash at your own risk.
Version history
| Version | Date | Notes |
|---|---|---|
| #249 | 2026-10-11 | Adds op1r's synths, effects and sequencers, MIDI CC, scale mode; undo for lift, drop, slide, split and join. |
| #248 | 2026-10-09 | Undo / redo popup and snapshot naming. |
| #247 | 2026-10-09 | First tape undo / redo build. |