I wasn't aware Yamaha had a harmonizer/vocalizer in their arranger keyboards or workstations? Unless of course you call that lackluster pile of digital dreck they claim to be a harmonizer competent. There's a reason companies like TC and Eventide make harmonizers, so other companies like Yamaha can try to mimic what they do but do so very poorly at best. It's nice that Yamaha and other companies offer harmonizer abilities in their keyboards but if you're going to put one in that's worthless, why not just forego it altogether?