Voice Modulation on Treo

Archived from groups: comp.sys.palmtops.pilot (More info?)

I'm thinking about writing a piece of software for the treo that would
allow one to select what type of voice they'd like to use in a phone
conversation. For example, if you select the "UFO voice" and called a
friend, you'd speak normaly into the phone but the friend would hear
something completely different.

Is this sort of application possible? I've looked through the api's and
can't seem to find one that would allow me to intercept the voice
stream, do some permutations on it, and then send it on its way over
the air. Does anyone know of an API that would allow me to do this sort
of thing?

Thanks for the help.