Hi,
I have tested that midi file the uTrack24 sends out the program changes with no problem.
Please do the following test:
Connect the Kemper to the uTrack24 connect the USB drive wait for the song preload. Push and hold down the stop button, in this case the uTrack24 sends out panic reset. Do you receive this on Kemper?
Next test:
Connect the Midi output on the uTrack24 to your Fast Track interface. Connect the Fast track to your computer as midi receiver. Start the playback on the uTrack24 and record the event in Cubase. Do you receive the midi data?