Hi, I am using Sony Vaio with Windows Vista Ultimate,Garritan Personal Orchestra, Motu Traveler, Novation Remote SL MkII. When I start Garritan, and play the piano, the pitch is alright, but while playing for sometime, suddenly the pitch transposes down. Now I am not being able to figure out what and where the problem lies. This has become a nuisance while doing live gigs. Can anyone help me out with this.