Hi Mario,
Can be used MELODYNE for transcription solos eg. the guitar tracks of audio that has a polyphony of other musical instruments?
Melodyne Studio will show all of the notes in a track but it can not pick out one instrument and only display it. No program that I know of can pull one instrument out of a multi-instrument track. It's like trying to pull the eggs out of a cooked cake.
You could go into Melodyne and start deleting notes that are not the guitar but that would be very time consuming, a real PITA and I'm not sure that that would work.