If you switched out or moved the mp3 files like they said in this set up then ya it's using midi mate.
https://www.project1999.com/forums/s...ead.php?t=2651
If not then I'd say it's using mp3. Not sure what your distro. is that your on, but I am using Ubuntu 18.04 LTS and I know sound goes at times when I am swapping out headsets and I have to relog the game eventually. Maybe all you needed was a reboot or something. I am fairly new to Linux myself, but it sounds like it sorted itself out for you mate. lol
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