Trust me PRauhala...You aren't the first musician to have that idea...I thought it would work too, but I tried, and I failed...If you have hours upon hours to spend just trying to FIND such software, and then spending a really REALLY long time learning how to use it, then another few hours resampling a WAV file at a different bit rate, seperating instruments (Which is technically impossible unless you're a producer), and then converting to MIDI, importing into Guitar Pro or whatever tab software you have, and doing whatever you have to do to it...Then be my guest...I think everyone else here would prefer to stick with ear transcription, however time consuming and difficult it is, it seems almost easier than taking so much time for something that might not even be possible at all.