Sound consists of:
PST_CString (instance 0): name of sound (e.g. "crash")
PST_CString (instance 1): type of sound (e.g. ".wav")
PST_CString (instance 2): reference id of sound in sound collection
PST_CString (instance 3): built-in id of sound, for sounds we ship. This is the id that's in the reg file.
PST_SoundData