Offizieller Kommentar
Hi,
I was mapping my Livid CNTRL:R and had the same problem, then I looked into my CNTRL:R editor and found out that the buttons send notes and not cc messages. As soon as I changed the notes to cc messages it worked, and I was able to map the Play/Pause and other buttons with success. If you have an editor for your controller, try to find out if it send midi notes or cc messages, if it sends notes you have to change it to cc messages and it will work.