I tried it with several MIDI controllers, but I always seem to have a big issue: basically the notes don't change pitch

The guy who sold me the module is honest and I do believe him when he said it was functional. He told me that he was using it fine with Pro Tools MIDI.
What can have happened? could it be a MIDI problem? is there any chance that I can solve this problem in any way without sending it to repair? thanks!
