I'll give a big +1 to Harvey's list.

I just had a listen to the Tyros 4 on YouTube. The "shoo-be-do-bop" vocal with wavecyling is cool, although obviously of dated. A lot of the vocal "magic" of the Tyros relies on being able to play specific pitches to match the melody - for example, the various "scat" demos. Also, the phrasing is pretty robotic.

On the other hand, having various vocal pads ("doo", "ahhh", "oooh") RealTracks would be pretty awesome, because you can change RealTracks on a per-bar basis. That's not enough to have the backing vocals sing "doo-bah" behind the lead, but it adds a lot of variety.

While changing on a per-beat basis would be cool, that's probably easier done with volume envelopes in RealBand (or your multitrack of choice).

The same thing would be cool for slow strings - a high, middle and low pitched set that could be switched between would be great.

While vocal pads and slow strings could be relatively static, I'm curious if anyone would like to elaborate as to what "horns" could be. Is there a particular style you're suggesting? It seems that's a rather large area...

-- David Cuny
My virtual singer development blog

Vocal control, you say. Never heard of it. Is that some kind of ProTools thing?