Enhance Speech and old Persian audio files

Hello everyone, I have purchased the Enhance Speech subscription and I wanted to clean up old Persian audio files with this program, but unfortunately the output of these files is very incomprehensible and has sounds (for example, a semi-mute person trying to speak) that are very strange and drawn out for a Persian-speaking listener. Please advise what I can do to fix this problem. (This problem exists in both version 1 and version 2)
Thanks