Fendermustang: [a new Ford model?]
My Ensonique DP-4 reverb box has a couple of interesting settings which I've used. One is called SWEETHARMONY and the other is NASTYHARMONY.
On an original tune I did a month ago, I used SWEETHARMONY on the chorus of the tune, which repeats the same words. [a country western type tune] It was great, not perfect, but pretty darn good for a black box. As far as buying a box to do vocal harmonies, I suggest you rent one for 90 days and if you like its performance, then go the 800 number route to find the best price to buy a NEW ONE.
Have fun harmonizing,
The Green Hornet