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If you have discord just drop me a message there. I'll help you find the corresponding data changes in version 1.1.0. My ID is Gemini#6765.
The original patch does not work on SourceNext, but this one does when you use it with my Classic REbirth DLL.
Only issue left about music is some incorrect panning, which I will correct later. The code is faulty, whoever made the port couldn't simulate too well how BGM works, but it can be fixed. After all Dualshock and Sourcenext use the same exact RDT, which I wouldn't touch since the original engine could handle all the music just fine.
It works totally fine when converted to OGG, I suppose the game libraries don't like what you fetched to it. On the other hand, upsampled voices sound noisy when ported to OGG.
Tried converting that already, doesn't work too well. There are issues with a few files, specifically status sounds, also voices seem to be in worse quality than 37800 counterparts?