After receiving my Axe III I could not bare to sell my Axe II mk1 that has been so good to me for almost 10 years. So I have the Axe II in the loop of the Axe 3 and guess what - the 2 makes a fantastic dedicated harmonizer (bare with me I'm getting to the point).
After lots of fiddling I've concluded there is only one way to make any harmonizer sound decent with distorted tones, and that is to have each generated harmony voice run through its own dedicated distortion blocks (drive/amp). With Axe II in the loop of the 3, I've got each harmony voice running through it's own comp,eq,drive,amp,cab,chorus,delay. Sounds better than any other harmony generation I've heard.
So - 3 Amps - Ya! - 2 for the two other harmony voices - and one for me! - then I'll sell my 2.