I recently got a CD-ROM2 set-up with the interface unit. It seemed to work fine, but now I notice that the CD audio is somewhat scratchy. Not all the time, just on the high parts of the music. It's hard to describe. I happens with games or with audio CD's. When I plug headphones directly to the CD-ROM, it sounds clean and perfect, so it must be a problem with the IFU-30 interface unit. I have the special bit to take out the screws, but I would have no idea what to check for. Anybody have any ideas?