Check out the manual:
ftp://ftp.digitech.com/pub/PDFs/Manu...2Manual_v1.pdf
You also might want to check out:
http://www.saxontheweb.net/Fink/ElectronicEffects.html
Excerpt:
Here are some rules for the harmonizer.
1. Close harmonies. Prevents that "sampled" sound
2. No more than 3 part harmonies. Gets muddy. Besides, how many (for me) tenor saxes can you have at one time and still be clean?
3. Custom scale/interval set-up are great because you can play solos as though you are a big band horn section! (I used it on tunes like Caldonia.)
4. Clip-on, close field mics work best in this situation. You don't want to harmonize the band noise.
5. Use a noise gate!!
6. MIDI foot pedals for quick changes. My setup for each bank of 5/key when in a blues band: I/IV/V/Thick (5 ms delay w/feedback and reverb/standard sound). The "Thick" sound is the one I mentioned in the Delay section.