there are some MIDI-to-WAV converters... they work not wirth every soundcard, but incase you have a regular, not too exotic card it should work. jut search google for them - most of them are free. just export you powertab thing to a midifile, convert it to wav and the wav to mp3. thats it.
but you could ofcourse record your solo with your guitar - that way it would be easier :D
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