Ok, I found the source of the crash, it's because your Grunt #66 is actually this entry :
- Code: Select all
Grunt-Female66a.wav, Grunt-Female66b.wav, Grunt-Female66c.wav
And thus no sound is loaded for the Grunt #66 and it crashes when the game tries to play it.
I'm not sure how you got the extra line feed ; it's Mac/Linux only, so if you open Sound.ini with Windows Notepad, you won't see it. Delete the whole entry and copy/paste it from the code above and remove the line feed in the middle and it should be ok.
I'll fix the crash for the next update, but it's not your core issue here...