thanks for the advice. to 4est,,,,i have a mac g4 with an upgraded ss hard drive, pure music installed, music ripped apple lossless with error correction on, wireworld ultraviolet usb to music fidelity vdac. i went this way due to price and the low jitter aspects of the wireworld and dac combo. since the huge library is set i probably can,t adjust this. any advice on further optimizations? thanks.. i really enjoy computer audio and the sound quality.