Cubase sending random MIDI messages to Arduino Controller

Right!

I’ve installed MIDI-OX and linked it to a loopMidi-Port which is also an output of a GR.

MIXI-OX displays (see image):
00 [= 0]
7F [=127 I think]
00
7F

So the problem hasn’t got anything to do with hairless-midi or my Arduino. It can only be Cubase or loopMidi.

Just check the images to see whether I’ve done everything correctly

If you check out the second screenshot, you’ll also see that my piano recording is full of some data, even though I didn’t even touch my piano.