Hi Mike,
Thanks for your message.
Cubasis’ Mixdown option comes with support for Wav / M4A / Flac / MIDI.
Please see more details regarding the topic in the online version of our Cubasis help.
Please note that native resolution support for the iPad Pro 11’" is on our list for the upcoming Cubasis update.
Of course, Cubasis can be used on the new device already…
To my knowledge, it is not possible to directly export audio files to Apple’s Music app from an iOS device so far.
Hope that helps!
Best,
Lars