[Shadowstar]

A quick fix for the warp sounds (stock or mod) is to just delete or rename the files in the sound folder:
StellarWarpPointEntering.wav
StellarWarpPointExiting.wav

I'd suggest renaming them, that way you still have the original files so you can restore them if you need to, but there shouldn't be any harm in deleting them either. This will prevent those sounds from playing.