The problem I have is quite similar to the original, I think.
The hi-hat, by itself, works fine: I can play open hi-hat (just hitting the pad), hi-hat pedal (just by pressing the supposedly CC hi-hat pedal) and closed hi-hat (by pressing the CC pedal and hitting the pad at the same time). However, when I connect the drum kit via USB to the computer (through Reaper, then through MT Power Drum Kit 2 plug-in), it only recognizes when I hit the pad and when I press the CC. The combination between these two (hitting an pressing) it's not registered in the program. Thus I cannot play a closed hi-hat properly.
I just read your reply, korakios, so I have not be able yet to test your suggestions (for which I am forever grateful!). I'll try it today or tomorrow if I'm able. Thank you very much again for your suggestion!
Edit: I have tried filtering the CC pedal, but that hasn't work either. Thank you anyway for your suggestion!