I've just been using Guitar pro to tab stuff and then export it to WAV and convert to MP3 using NHC Switch. NHC Also do a free programme called
Soundtap that allows you to directly record whatever is playing on your pc.
EDIT: Soundtap and Switch are free if you use the basic home use version or downgrade to it after the trial period is up. The basic versions seem to have all the features you need for this kind of thing.