Hi,
Our colleagues from Line 6 confirm compatibility between Sonic Port and Cubasis.
Guitar input, stereo aux input and Mobile IAA has been tested along with Cubasis and works as expected.
Please double check the privacy settings of your device:
If the app (Cubasis, Mobile POD, any audio app) is used for the first time the privacy settings for the microphone need to be set: Settings-> Privacy-> Microphone-> enable access for Cubasis, Mobile POD etc.
The Sonic Port audio channels enumerate in Cubasis as:
Mono Input (1,2)
Stereo Input (1&2)
Best,
Lars