Hi, I have a Sony MZ-R90, without a USB conection. How can I transfer my songs (most live recordings) to my computer? I also have a Sony MZ-NH600 which has USB. I imagined that I can swap the disc from th R90. But, surprise: Event that I can play songs on the MZ-NH600, my computer does not recognize the Disc. I have SonicStage v3.3 How can I do? Tanks a lot, Laurent Luxemburg(Europe)