I have an older Denon receiver (AVR-3200), with optical and coaxial digital audio inputs. I'd like to hook up a blu-ray player (via coaxial) and my MacPro (via optical) to the receiver and be able to switch between them, but is this possible? I don't have the blu-ray player yet, nor the optical cable, as I'm still kind of designing the system, so I can't test it. It looks like both inputs on the receiver are simply referred to as "digital" inputs, and I don't see a way to switch between optical and coaxial. But maybe there needs to be signal present in both inputs first? I'm a complete noob in terms of digital audio, so any help is appreciated.