We have tested and found no issues with AMPLIFi, Catalyst, Firehawk, Mobile POD, and Spider Remote applications on iOS 15.4 [iPhone 11] and iOS 15.4 [iPad M1].
Sonic Port works on iOS 15.1 [iPhone 11], but is untested on iOS 15.1 [iPad M1] (although we expect it to work). Sonic Port VX works on iOS 15.1 [iPhone 11] and iOS 15.1 [iPad M1].