Some people got audio issues (again, not PC-exclusive).
I noticed and documented audio issues in Castlevania 1, you can hear them
here.
Stalker and the level clear jingle both have high-pitched beeps in them. They are guaranteed/ consistent, meaning you can't avoid them and hear the songs as they're supposed to sound. I encountered this on both Switch and PC, so we can assume for now that it happens on all platforms.
There may also be aliasing issues with the audio. In that same twitter thread I posted a comparison of the SFX for attacking the bone pillar enemy, and it sounds very different. This is a
very minor gripe compared to the beeps, but it's indicative of other possible minor sound issues.
Good news is I've heard most of the CV2 tracks now as well, and I haven't run into anything big/ obvious there.
Someone is suggesting that the SFX in Bloodlines are a bit off as well.