Some music notations may be saved in ASCII files (.ascii) and such files can be usually imported to various music notation and music composing programs, for example Guitar Pro. Thus, it should be really possible to convert such .ascii files to .midi music.
Convert ASCII text characters file to MIDI audio.
We have found 2 software records in our database eligible for .ascii to .mid file format conversion.
Microsoft Windows software - convert ascii to mid on Windows
Multi-track editor and music composer for guitars
Convert from ascii 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 ascii 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 ascii to mid on OS X
Mac version of the popular tablature editor