Thanks for your reply.
Yes, I've seen several videos on creating virtual choir effects with Melodyne and certainly it has some advantages, one of which is that the "singers" can sing any lyrics I choose.
At the moment, I am, however, specifically interested only in learning how to use samples in the "Presence XT Core Percussion and Vocals" virtual instrument. Granted, the only "lyrics" it is capable of articulating are "Hah, Huh, Hmh" but for my purposes, that would be fine (for now). At some point, I will give the Melodyne "hack" a try... but for now, I'm only looking for examples on how to use the samples provided in "Presence XT Core Percussion and Vocals". I am looking for (preferably) youTube videos demonstraiting its use.
Thanks again for the reply.