so I grabbed a show off the archive by The Rugburns...and it REALLLLY sounds like the tape speed is too fast...anyone know any way to slow the wav files down and then resave them?
Perhaps it's due to a 44.1/48 kHz mixup during conversion. Try switching sample rates (w/o resampling) and see if that makes it right. If not, you'd need to time stretch the entire file (assuming it's constant throughout). If you have a good ear, you can do this by trial and error. Otherwise, you can do an FFT analysis on pure tones (maybe if you have a good solid bass note somewhere) and tune using that.
I have used Soundforge to do this in the past.