Well, I substituted audio files, but used a voice of my own that said "bumP!" when I had a collision, and it still only played about half the time. I'll try some further checks and distribute the audio file that s7rikeback sent me. We've been checking into that, but we are definitely not as efficient as you, kind sir!
Now, how would the same issue come back into SH4, and why would it not have been noticed sooner?... Now that I look at things, the files that s7rikeback has are the same as what's in FotRSU, both dated 11/24/2004... hmmm... what date are the good files from Jeff-Groves?... I haven't a clue as to which version I have on disk, lost in a drawer somewhere around here...