Can I easily convert .gp3 files to .mid format?
Converting Guitar Pro 3 Tablatures directly to MP3 Audio Files (.gp3 to .mid conversion) is certainly possible and should be quite straightforward.
Use the Guitar Pro software itself, as it allows users to directly export the data of GP3 tablatures in MID format.
A multi-track editor and music composer for guitars
A free cross-platform music notation software