Whatever I tried:
My iPad Pro (9,7“) AND my iPhone 8 Plus both were upgraded to IOS 13.3 and do not recognise the hx stomp’s USB out. I can’t choose no midi in, no audio in.
I use the original Apple Lightning to usb 3.0 adapter (camera connection kit) which also features the lightning IN for power. Also tried different usb cables. The hx stomp Firmware is 2.82.
Strangely enough, when I plug in the adapter to iphone or iPad and there is no device connected, an error message turns up: accessory cannot be used, usb 2.0 hub, not enough power or similar. But even when I power the adapter, it does not see the hx stomp. I bought the adapter some weeks ago at Amazon.
I called the apple support, but they could not help.
Anybody else had this? Does your setup work with IOS 13.3?