oscmix is a relatively new free/libre control program for RME Fireface audio interfaces. It’s both a desktop application (GTK3) and a web app with the same functionality.
Most vendors of audio hardware either don’t bother with Linux support or, in some cases, provide gear and guidance to FOSS developers. I don’t really know which camp RME is in these days, but oscmix seems to be getting there as a free/libre replacement for RME TotalMix FX.
The project was originally developed by Michael Forney. huddx01 picked up where Michael left off last year and started writing missing code and improving things. Nightly builds are now available and make it easier to test the program.
Much like with some other FOSS applications (Qtpfsgui, anyone?), the name reflects what the program actually does under the hood: use OSC over USB MIDI to control the following audio interfaces:
- RME Fireface UCX II (supported)
- RME Fireface 802 (WIP)
- RME Fireface UCX (WIP)
- RME Fireface UFX+ (WIP)
- RME Fireface UFX II (WIP)
- RME Fireface UFX III (WIP)
The lead developer doesn’t have a feature parity comparison against TotalMix FX but states this:
Most things work, but still needs a lot more testing, polish, cleanup. Some things still need to be hooked up in the UI or implemented in oscmix.
If you have one of those in the studio and are interested in helping the developer improve the software, check out nightly builds. oscmix is available for both Linux and macOS, both x86_64 and ARM64. The web version is a separate download there.
This is a companion discussion topic for the original entry at https://librearts.org/2026/03/introducing-oscmix/
