So we are comparing the vocalizer on the Pa3x to the Tyros 4, to the Audya

Has anyone compared all three?

I own the AUDYA 4 and AUDYA 5 and can honestly say I've never hooked up a mic to it,
let alone test its vocalizer features

A friend of mine just bought a Pa3x and raves about it, how you can play an MP3, sing , and it will harmonize based off the mp3 that is playing, he says it reads the chords and harmonizes accordingly

I know Korgs Harmonizer is based off, or is a TC Helicon

Is is miles ahead of Yamahas or Ketrons?

How do the 3 compare to each other? Which is best, seconds best? Etc.