I picked up a Yamaha THR5 as a desktop amp that I could also use to record with. I’ve recorded on both an iPad and Mac in the past so wanted it to work on either of these. The bad news for my iPad is that it doesn’t recognise the signal coming into it.
I tried USB from the amp into the camera connection kit then into the iPad. GarageBand and Bias don’t show a signal at all. Yamaha could patch this one but not sure what the demand is. I can’t try usb-c as I have an older 10.5 with a lightning connector.
So I can record with my MacBook so not the end of the world as I’m quite used to Logic Pro, which is a superior app to GarageBand anyways.
Only option for getting an iPad input is to use the headphone out or a microphone plugged into the iPad.