Thank you for information! Hi to everybody. After all discussion and help I got, I realized how easy answers were on both of my question. I tried and works perfect. 1. To connect MZ-RH10 to playback through receiver, as I was told by Kevin, the RH10 has no line out as such (mode or jack). Turn the volume up to around 27/30 and make sure the sound setting is EQ Off, you should get a reasonable "line-level" signal to connect earphones jack to your system (receiver / amplifier). 2. To transfer old MDs in to HI-MD mode and have adventage of reformated old disks in Hi-Md mode with much more space, just connect your "old" MD deck with optical cable (RadioShack #1501597 6-FT Digital Cable $6.97) to your HI-MD and setup recording in Hi-SP (2h 20' on 80min disk) or H i-LP (10h 10' on 80 min disk). Enjoy your old music and have 2 or 6.5 times more music on same "old" disks. One more time thanks to Kevin and A440 for help!