A few thoughts on synthesized choir patches. I was researching vocoders the other day and thinking about adding one to the music room. I've always loved the sound, but there's hardly a more electronic-sounding effect on earth. Still, the Roland models offer a decent choir simulation that allows for diction with some clarity. It's tempting. But for the time being, I decided to fire up the old eight-voice Poly Evolver and let her run around a bit. The thought continued to be the venerable choir sound. As is the case with my sound design in general, I never intend to fool anyone, nor do I ever want to achieve that degree of realism. If I do, then I'll turn off the synthesizer and go join an actual choir. No, I want my strings, brass, organ, and choir patches to sound positively synthesized, but - ironically - in a minimally electronic and maximally natural way. That's the strange challenge, and it's one reason I'll probably never use a vocoder or a mellotron.
Regarding choir patches, I prefer one that is warm, expressive, mysterious, and especially strong in the bass, baritone, and alto ranges. If the music is to have a noble spirit, then the sound must be equally noble and free of everything ridiculous and irreverent. And when the moment is right to employ it in the midst of a piece of music, dropping your left hand on the keyboard must fill the air with an ethereal beauty and loftiness of spirit that makes one a better person, or at least makes one want to be a better person.