Cracked it. This sequence works:
- Start Djay
- Connect Mixtour
- Go to [Settings] → [Audio Device Setup] and turn on [Output to iPad Speaker]
- You should now be able to hear music coming from the iPad
- Connect additional USB output
- You should now be able to hear music coming from the secondary output
In settings you can see that at this point Djay doesn’t see the outputs on the Mixtour anymore. It will only show your secondary destination.
Every other scenario (app restart, USB disconnects, etc.) didn’t work for me as Djay gets lost when it shows both sound outputs.
It is most certainly a flaw in Djay, as the extra output works under all conditions on the iPad (testing with Spotify). The routing in the app fails somehow. When this happens you can’t even use the iPad speakers anymore as they simply stay silent when you flip the switch in Djay’s settings.
