auto tuner recommendations?

[Sean]

Hey all. I'm working on a remix for a guy who doesn't sing so well....doesn't profess to be much of a singer either. He does Weird Al style parody music. Anyway, as I've been adding in backing instruments, his out0of0tuneness is becoming more and more glaring. Does anyone have any good recommendations for auto tuning software, ideally that can work easily in conjunction with Reason?

Thanks!