The sound options for SexLab are pretty bad in general tbh, having gotten used to OStim's synced sounds the unsynced loop souds in SexLab feels so primitive.I tried that mod and it's add-ons. Very hard to understand and setup first time, but i did it. I respect the huge work of that modder. But it became an extreme hentai with lots of slime sounds. The english voices are nice, but some lines don't fit well. Still not what i was looking for. Thanks you for your suggestion btw.
Sound is just a much lower priority there, sadly.