In the light of experimentation

[wyleu]

In light of @riban suggestion, The Zynth doesn’t seem to like to start up with an audio in only device … So until I’ve fixed tha I wont get to try alsa_out on the hifiberry to see how it goes.

USB Headset

Yep! Linux + Jack supports a single sound card. The reason is that the sound subsystem must sync to the device’s clock and each device will have a different clock. Some professional soundcards costing many hundreds / thousands of pounds support slaving their clock to another, e.g. using word clock or links between cards but these would need to present as a single device to allow jack to use it as its master clock. There are some solutions which allow multiple sound cards to hook into jack, like…