While trying to record the video I noticed different behavior.
It is not consistently reproducible as Djay seems to store (and recall) more info than just the outputs that show in the settings.
Once I got a working setup it recalls that setup even when I disconnect and reconnect the second USB destination. In other words, it just works. The problem is when you somehow do not have a working combo it will recall that setup, with your sound (possibly) being routed into the void (although the second destination consistently works for other iPad apps and the settings might show the exact same / correct routings for ‘Main Output’ and ‘Pre-Cueing’).
So it looks like Djay recalls routings on a lower level than just the drop down in the settings.
Now for the exciting bit, I currently have all sound destinations working at the same time (both stereo Mixtour channels and the second USB destination - using the ‘Booth’ output in settings). So this means multiple USB destinations do work after all.
Getting it up and running is fiddly though.
