I had some success with the Airtunes/AirPort Express route. Unfortunately, it is still not 100%, and some track marks are still not getting through in the MD recording process. I also tried Roxio's Jam (S/PDIF through Edirol UA-1D) with various x-second gaps, and surprisingly no success either. All sound files on my Mac are AIFF, and are not from a gapless album. This is very frustrating....