Gonna start trying to debug this sometime soon. Video preview is very helpful though, thank you.

I looked into this some more and I did see the same issue. I've been testing with a variety of changes to the script but I'm not seeing much of a difference.
The reverb effects are working as intended but, I can confirm that the volume is noticeably lower in stereo. It's not to the point of being inaudible or anything but it is a bug. I'll try tinkering with the script some more later but I just wanted to update you.

just want to add issue is very noticable on Steam Deck as audio is locked to "2 speakers" config and cant be changed breens speech is barley above a whisper with the mod enabled sadly i dont have a video or id show proof

for some reason its not loud its just low volume cant hear what hes saying