I use a Sony 520 deck and a Sharp 722 portable, and everything recorded on one plays perfectly on the other, including mono recordings. I've been very happy with both units. I recently got the little Aiwa bookshelf unit (XDM110? not sure of the number) and it came with a free portable player, those have worked fine as well. Of course, I hate any unit that has only a digital in but no digital out, like that Aiwa and the Sony CD to MD dubbing deck, what a stupid idea, having no digital out or keyboard input! ----------------------------------------------------------------- To stop getting this list send a message containing just the word "unsubscribe" to [EMAIL PROTECTED]