Hi guys, I'm sure a lot of you can help me with this problem. I got an horrible hum noise when recording my band rehearsal with the Minidisc using the AC adapter. I've read in the manual that is possible to experience this noise if one touch the cable when recording but no one touches anything and even the cables (mic and AC adapter) are separate. On the other side, when using just the power of the battery everything is quiet and wonderful sounding! The MiniDisc is a Sony MZ-700 and the mic is a Sound Professional BMC-2 mini binaural. Thanks for the help!