Latest version of 1.12.2 Forge.
Latest version of Sound Physics.
Latest version of Dynamic Surroundings.

I have not tested whether this crash occurs without DS present in the modslist.

crash-2020-06-21_23.50.40-server.txt
crash-2020-06-22_00.00.49-server.txt
crash-2020-06-22_00.03.32-server.txt

**also note that these crashes occur during world generation. It is impossible to run or even generate a world with this mod configuration.

I don't think you're running the latest Sound Physics version. The latest version is available on the releases page. Here's a direct link to the latest version. It should work fine with this one.