I'll try to be as descriptive as possible for you experts out there. This has worked in the past which is what confuses me. I have a Yamaha HTR-6030 5.1 receiver and a Santa Rosa Macbook Pro. I'm using an XtremeHD Optical Cord with a headphone jack that was bundled with it (bought at the Apple store) I've got the receiver set to "CD" mode as thats the optical port I'm using on the back of it. In the Audio MIDI setup panel (where I've gone in the past to make this work) my settings are Digital Out, 44100.0hz, 2ch-24bit. I'm not able to select anything more then 2 channels, so I'm missing out on the rears (not a big deal) and the center (more of a big deal). What am I missing? How do I get the computer to shoot 5.1 out? Halp!