Angela,
I'm having a similar problem on Ubuntu 8.10 on an Acer Aspire One. I'm using the Debian installation, not via wine. Anytime I try to rewind, fast forward, stop/play, it actually fast-forwards the tape an uncertain amount. One one tape (approximately 11 minutes) it was fast-forwarding 20 seconds. On a different tape, it was more than 40-60 seconds per forward.
I really want to use my netbook for transcription, but until I get this fixed, I'm stuck with my less portable (yet sufficient, I guess) 15.4" laptop.
Anyone have any help?