Sorry if this is a naive question but I"m a complete beginner when it comes to digital music and I haven't been able to find the answer. Suppose you have an iMac with a lot of music files on its hard drive, in Apple lossless format, and you want to play them back through your stereo system in a different room by streaming them wirelessly, using Airport Express connected physically to a Cambridge DacMagic. (This is the setup I'm thinking of, anyway.) Would the wireless streaming degrade the sound quality? If so, how do people find a way around this? Since I'm posting anyway, can I ask another beginner's question? Suppose you want to buy and download albums using iTunes. Is it possible to choose between different masterings of the same album or do they only ever stock one version of any given album? And if you see an album you like, how do you know which mastering you're getting, anyway? I'm not giving up on vinyl BTW but I just thought it would be interesting to experiment with digital music.