I have a Simmons Stryke6 USB drum pad connected via Camera Connection to my iPad Pro. In GarageBand and in the Stryke app, I can play reasonable rolls and fast patterns. In just Cubasis, lots of pad hits are missed and it’s basically unplayable. Only simple quarter note patterns are reliably detected.
I found this topic, but increasing polyphony to 128 made no change: https://www.steinberg.net/forums/viewtopic.php?f=183&t=93152&p=518445&hilit=pads#p518445
Is there anything else to change in the project to make Cubasis more responsive to the pads?