Is it possible route a source directly to a sink completely within PA without affecting other sources? The reason I ask is that I got one of those USB turn tables as a gift and I would rather use the USB connection for playback instead of the RCA cables (for one they're too short to make it to my receiver without extensions) and it uses Burr Brown A/D converters which should provide good quality. Additionally I'm using SPDIF for audio output from my MythTV box to my receiver so it should just be able to pass the audio on as a 44.1kHz PCM stream to my receiver right? Thanks, Richard