hello LUGroupers...i came across this website that let's you compare Sample Rate Conversions between all of the various Audio Applications. one thing that seemed amazing to me was the difference between the quality of Logic 7.2.3 and Logic 8 on Tiger....and then the difference between Logic 8 on Tiger and Logic 8 on Leopard. clearly Leopard provides more sophisticated enhancements to the Core Audio drivers. big thanks to Infinite Wave for providing this critical information! enjoy...