mmf to wav conversion is most often searched for options how to convert old mobile audio files in the MMF (Synthetic Music Mobile) format to standard WAV format, typically in effort to edit the content or reuse it for another purpose.
Awave Studio certainly supports MMF files and perhaps on some abandonware website you can find old utilities from Yamaha called SMAF Tools that supposedly could be used to export .mmf files as well. But except for that, we have not found any useful information about this subject thus far.
Updated: October 30, 2023