op1r

Custom firmware patcher for the original OP-1: new synths, effects, sequencers and a plugin system

Source

op1r custom OP-1 firmware GitHub repository — op1r on GitHub.© pcppcp

Works with

Original OP-1 with the official R246 firmware file (op1_246.op1)

Good to know

Firmware risk: Unofficial firmware for the original OP-1 on TE firmware 246 only. Back up tapes and sounds first; flash the official 246 update to go back. Early community builds have left units stuck on an error screen at start-up.Source Source

About

op1r turns TE's last official firmware for the original OP-1 (R246) into a custom build, patched in the browser from your own firmware file. It adds new synth engines with their own screens (a supersaw, an FM bell and a granular engine that can record straight into its slot), new effects such as a vintage tape echo usable on instruments and the master bus, extra sequencers and modulation, and an improved sample editor and tape tools. It also has a plugin system for creating and updating engines and effects. Several other community firmwares (Maiko Pruett's builds, Hundekraft) are built on top of it.

Devices

OP-1

Platforms

Web

Pricing

open-source

License

GPL-3.0

popcorp (pcppcp)

Last verified

Oct 18, 2026

Source: RedditSource: RedditSource: GitHub