I can't even sing happy birthday on key!
You know how the 'Performance Assistant Technology' feature that Yamaha has in the PSR3000 that assures every note you play will fit the music -- no wrong note will sound -- no matter what you are playing pressing -- chords arpeggio etc?
If they can add the Performance Assistant Technology to the vocalizer, LOOK OUT ...
I always wanted to yodel.
Maybe that could be one of the preset buttons.