(Sorry for my language, I'm french)
I change a parameter (exemple : Blocks), It's good but when i change an other parameter (exemple : music). It's crash and I have a report on the launcher.
It crash every time on the 2nd changing
The report is on the file.
Good luck and have fun 🙂
EDIT : Frendly creature crash directly
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I also have this problem, it appears to only happen after adjusting more than 1 sound value.
So say if i lowered music and then i was to change hostile mobs sounds it would crash
I get a crash when I lower the hostiles sound effects (13w42a, too).
Happens to me too. It seems that as long as a sound for a particular category (such as Blocks) doesn't play, I can adjust the volume level for that category with no problem. But once a sound from the category plays (such as Piston extending), MC will crash if i attempt to adjust the volume for the category.

Duplicate of MC-35655 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.