Much too late for a response, but have you looked at the MicroChord option (press F6 on a measure to bring it up)?

For example, you could set up a Motif pattern like this:

x . . x | . . x . | . . x . | x . . .


-- David Cuny
My virtual singer development blog

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