Thanks to all who enlightened me. I believe I now better understand how it works However I wish that on pitch shifters manufacturers would only use the number of steps or ½ steps from the standard the pitch is shifted (like the DigiTech DropTune). Using designations such as m2, M3, P4, etc. suggests to me that you are keeping the shifting within the appropriate scale (i.e. intelligent harmonizing), which it is clearly not.

I do hope that EH comes out with their own harmonizer someday soon. It would be a nice addition to the Pitch Fork. I’ve watched the demos on the Boss PS-6 and Behringer US-600 and I am not very impressed with their sound quality. The Pitch Fork sounds way better. I have a TC Helicon vocal harmonizer that appears to work pretty well on voices. I’d like to have a similar product for my guitar; perhaps to do a Dickey and Duane harmonizing solo or something. But maybe the Electro Harmonix product development team already has one in the worx. It could happen.