I have the same problem. Through the headphone I only hear direct monitoring (clean guitar) or dspmixfx output.
No Bias FX (I have tried also other ios guitar effect apps) output in the headphone.
This is really frustrating !! I bought the UR22C because of native IOS support !
How should I use UR22C with ios effect apps like BIAS FX, BIAS AMP and so on ?
Thanks