himder

Hi, I just got my MZ-NHF800, Hi-MD. Works pretty well ... except when I used SonicStage to transfer an mp3 file to my minidisc, it played back at least twice the speed. It was a radio talk show hosted by a baritone (and he sounded fine when I played the file on the computer), but the guy sounded like a chipmunk on the recorder. Any suggestions? Both files are 64 kbps. The one on my computer is 53 minutes (24 mb), and the one on the minidisc is 27 minutes (12 mb). What's going on? Thanks.