Thanks, BearBoy. Many of my MD recordings were done on a different machine - on Sony MZ-R37 before Hi-MD ever existed. My Sony MZ-RH1 came later and I thought it supported NetMD, but I'm not sure anymore. I also have a Sony MDS-JB920 which seems pretty cool, but apparently it may not be a solution either. This is frustrating, and I may have to just run the audio and re-record on a new digital audio recorder - and that takes time.