Hate to break up the southward journey, but I did use the internal vocal processor/harmonizer on the PSR S970 for the last hour or so last night.
It worked fine. I actually the sound of the vocals. Using one voice a third above works good with the harmonizer.
My main two grips...there is no light to show when the harmonizer is on, without opening the mic screen. And there is still a slight glitch when you engage or disengage the harmonizer while singing. If you time it so you turn it on or off between notes it's fine. It is not as noticeable as on previous models but still there.
I've been spoiled by how seamless the T.C. Helicon harmonizer works.
Having said this, I will eliminate the outboard processor to cut down on clutter and connections. Audience don't know the difference for sure.
I'm glad the keyboard remember the settings I set up some time ago. Now I have to set it so that the registration memories don't change the pedal assignment.