new sansa not showing recordings

I recorded about 15 books which show on the computer when my  Sansa is pluggedinto my Mac., when I try to open and listen to my recordings the sansa only shows empty.

Anybody help?

What format are the audio book files in? And/or are the ID3 tags the correct format (ID3v2.3 ISO-8859-1)?

Were you connected to the Mac with the Clip’s USB mode set to MSC?