Music educator Don Lewis performs an impressive vocal synthesis rendition of Amazing Grace, using the Roland VP-770 Vocal & Ensemble Keyboard.
Roland designed the VP-770 for a new category of musician - the vocal synthesist. And, as Lewis' performance demonstrates, the VP-770 is actually making that a viable category, letting you create very musical backing parts, such as a large gospel choir.
Pretty amazing, isn't it?
More demo performances are available at the Roland YouTube channel.