I am having one annoying, but very minor, bug; every time I fire an autocannon it sounds like it was shot a kilometer away from my position. Laser, missile and melee sounds work fine. What is going on?

My modlist:

Coyote Mission Pack
Color Heat Gauge
Better Hangar Lighting (Minimal Fog)
PGI Infantry
Xenopax Optimize

All mods have been checked for updates and reinstalled if necessary.

It was in the patch notes as a known bug.

Ok, I'll take a look. Thanks!

A mod has just been released that addresses the autocannon sound issue. Until the issue is patched out this is the best option to fix the bug.

https://www.nexusmods.com/mechwarrior5mercenaries/mods/563