The matrix mixer capability of the RME Fireface 400 is now available through ffado-mixer. There is still some functionality remaining to be done, including:
- Phase inversion, mute (requires tweaks to the matrix mixer GUI)
- Better labelling and control sizing
- Retention of settings across ffado and device restarts
I plan to fix the first two up in the coming weeks (the third may take a bit longer). In the meantime, basic matrix fader operation should work on the Fireface 400. Testers are welcome. As for other FFADO devices, one does not require the streaming component of FFADO (though jackd) to run in order to control the mixer through ffado-mixer: just run ffado-mixer.