Guitar Pro possess the capability of exporting its own (.gp3, .gpx etc.) projects as audio and save them as MIDI files which you can further convert to other audio files. It doesn't seem any other program is capable of this type of conversion.
Convert Guitar Pro 3 project to MIDI audio.
We have found 2 software records in our database eligible for .gp3 to .mid file format conversion.
Microsoft Windows software - convert gp3 to mid on Windows
A professional multi-track editor and music composer. Musicians uses Guitar Pro to create guitar and bass tablature. Also is used to write musical scores. It is available in versions for Windows, Mac, Linux and iOS.
Convert from gp3 file
to mid file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned gp3 to mid. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
MuseScore is a free cross-platform WYSIWYG music notation program that offers a cost-effective alternative to commercial programs such as Sibelius and Finale.