Guitar Pro possess the capability of exporting its own (.gp5, .gpx) 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 5 project to MIDI audio.
We have found 2 software records in our database eligible for .gp5 to .mid file format conversion.
Microsoft Windows software - convert gp5 to mid on Windows
Multi-track editor and music composer for guitars
Convert from gp5 file format
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 gp5 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.
Apple macOS / Mac OS X software - convert gp5 to mid on OS X
Mac version of the popular tablature editor