These are the 2 best voice changers for online gaming.
This one's called av voice changer.
You do not require a good mic for this one.
This one's called morph vox pro. I used to use it.
It will only work right if you have a good mic.
Morph vox pro's audio is very quiet if you don't have a good mic.
Games these will not work on:
Left 4 dead 2
Multi theft auto san andreas
Games this will work on:
Half life opposing force
and many more games