Tried all of the above ( buffer down to 4) and still a massive delay making it near impossible to play anything above 160 bpm which is a damm shame as the samples are fantastic on the 260, "tower ballroom" quint and tierce are to die for. Running windows 7 ,250 gig hd,3 gig memory and only running miditzer on it. Midisport 2x2 interface for the yamaha hx3 (accomp,great, pedal)and casio keyboard(solo) seems to be a greater delay on the solo