Alright here's the thing. I'm trying to learn this song and during the bridge section, Tony Harmonizes with George Lynch. Now, my Zoom G2 has a Harmonizer so i was wondering what settings should i use on my Zoom if were to play Tony's part.

Basically what key and modulation setting should I use?

For example,

Key of A minor, 1/3 down and so on
Jackson Pro Series DK2M Dinky
Ibanez GRG 270
Ibanez Tone Blaster 25R
Zoom G2
DigiTech Rp50