Mr @jypma & me have been working on improving the zynthian’s audio routing. This include:
Layer’s audio output can be routed to 1 (mono) or 2 (stereo) system audio outputs.
FX-layer’s audio input can be connected to 1 (mono) or 2 (stereo) system audio captures.
Sound-cards with more than 2 outputs/captures should be supported on this way too!
Of course, all the new functionality is accessible from layer’s option menu …
Please update and test …
The details & discussion here: