I've tried my best to create a choir patch on the Prophet 12 but am not especially satisfied with the results. Has anybody designed a really fine one? I'd love to hear it and learn what are the secrets.
Referencing this from a Pro-2, but the idea is the same:
Use one of the Aux Env (4) to dip the pitch of one of the oscillators (Osc 4)
Use the other Aux Env (5) to dip the pitch of Osc 2; make sure that the Attack and Decay are different (shorter)
Super Mellow on Osc 1, C2 @ 90
Ohhhh on Osc 2, C3 @ 90, slight slow LFO mod against pitch
Ohhhh on Osc 3, G2 @ 14 (this actually makes a nice difference in the formants
Super Ohhhh on Osc 4, C2 @ 75
Add varying amounts of Glide (less than 10) to each.
You should be able to get there fairly quickly from there. It may start out sounding like a hurdy-gurdy, but you can tweak it from there.