Problem recording mod wheel

Dear All. i'm trying to record the mod wheel using my Oxygen8 controler. I'm recording it over a solo violin track (from Garritan PO). I can record it ok but when i play back I can't hear the violin! In Sonar or Cubase, which I am more used to, this is easy enough but I can't seem to do it properly in GB3. Help!

Cheers, Maestro-C