But they are many voice morphing programs out there that does excellent jobs to morph voices to sound like a different person. Giving you maybe 10+ casts for 1 person.
Cobra, you should use this if you don't have enough people to give you voices. If you have 1-10 very good voice actors, you could give them roles to voice more casts, and morph their voices to a different voice that sounds suitable.
Of course, accents can't be changed. But if a voice actor can do different accents, you're golden. 
No, they do a terrible job.
When I was running this, there were a couple of submitters that for one reason or another decided to use a voice morphing program. The voice morphing program destroyed the quality of the audio, by making it terribly noisy and/or amplifying/morphing the noise in the audio. When these submissions were put beside another actor (even the terrible VAs) the audio at best sounded like bad impressions of Steven Hawking, at worst is was unintelligible. This is in addition to the morphing process making the voice standout against all of the others which is not generally what we are looking for.
Yes, accents are cool, but most of the VAs that I got to hear, were actually quite bad at it,
I am 100% sure that those people didn't use a good voice morpher.
They are very good voice morphers out there. Have you ever thought about the 100's of movies where they have dark evil voices? Like Lord of the Rings, Saurons Voice. I know they exist and I've used them in the past with pretty nice results.
Some morph your voice on the spot for ex playing with your friends with skype, ventrilo etc,etc. I found one of those that makes a pretty nice job and it's named Screaming Bee.
Some others take your spoken line, and analyzes it and morphs it for a higher quality.
Trust me, just think about all the movies and games where they have used morphers to get a desired voice.
Judging after what some people did with their voices for a role, is really ignorant. Look it up yourself.
