Teenage EngineeringSynths
Portable synth, sampler and tape sequencer
The OP-1 is a portable synthesizer, sampler and sequencer from Teenage Engineering of Stockholm, released in 2011. It combines multiple synth and drum engines, built-in effects, several sequencers, a four-track tape-style recorder and an FM radio for sampling. The device has a small colour display, four colour-coded encoders, a rechargeable battery and USB audio and MIDI. A Blackfin DSP runs the instrument.
Original OP-1 only. No custom firmware was found for the OP-1 Field, OP-Z, EP-133, EP-1320 or Pocket Operators. R246 (2022-12-13) is the latest official OP-1 update on Teenage Engineering's download page. Repacker-based mods target older builds (tested on 235); op1r targets R246 only. Mods are installed through the standard update mode and leave the bootloader untouched.
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
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
| 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 |
SDK for adding synth engines, effects and sequencer features to the original OP-1 firmware R246, written in C or assembly, with simulator tests and a composer that patches your own official image.
| Version | Date | Notes |
|---|---|---|
| v0.1.0 | 2026-10-15 | First public release; no firmware binaries. |
Work-in-progress OP-1 emulator built on a Blackfin CPU simulator, booting a real firmware image and NAND dump, with a headless mode for scripted runs.
by op1emu
| Version | Date | Notes |
|---|---|---|
| main @ 9563edd | 2026-10-13 | No tagged releases; this is the latest commit. |
Desktop GUI for op1repacker for macOS (Apple silicon) and Windows 10/11, with extras including the Glitter theme engine for building custom colour themes.
by epixjava
| Version | Date | Notes |
|---|---|---|
| main @ 59a7e84 | 2026-07-11 | No tagged releases; this is the latest commit. |
Python script that applies a JSON colour theme to an official OP-1 firmware file, producing a themed .op1 update. Uses op1repacker.
by Nanobot567
| Version | Date | Notes |
|---|---|---|
| main @ 816901e | 2025-04-04 | No tagged releases; this is the latest commit. |
Python tool that unpacks, modifies and repacks official OP-1 firmware files. Ships ready-made mods such as the hidden iter synth and filter effect, subtler default FX levels and custom graphics.
by op1hacks
Brick risk. Flashing this carries a known, documented risk of damaging the device.