Bus problems no audio with groove agent 1

Hey guys , my 1st post. I am using cubase6 and am producing my own drumbeats using groove agent 1. When I open GA1, and tap a pad, it shows the sound in inspector level but no audio coming through, it use to work fine but i played around with my bus’s (VST connections, input output and studio) and now i cant hear anything when i open GA1 and tap a pad. i think it may be a bus that i havnt activated or made?
thanks rick