oh, vox, huh?

well, a sampled voice is useable. the korg Z1 has a very cool choir patch on it from the factory as well. I fact I have an example of said choir sound, if you wish to hear it.

Here is the link: http://www.garageband.com/song?|pe1|S8LTM0LdsaSlY1KyZmw

its pretty airy and might do what you need. The Z1 is a great device for cool digital pads and the like.