When I switch to MME drivers in Biab it sounds wack ! I have a M-Audio Mobile Pre , and I have problems with RB . It only plays one beat (at a time) then stops or it freezes and I task manager it closed . I have only just now tried RB for the first time ,but have used Biab since 2004 . 3gig p4 3gig ram 2011 biab everything pack installed latest updates to biab and rb win xp sp1