I know they are fairly complicated to use, I don't have a lot of experience with the Antare's, but if you are interested in that type of processor in a much more user friendly format check out TC Helicon's newest arrival. The Voicetone Synth pedal, check out the samples on the page. I have the VoiceTone Harmony M and it works great.
http://www.tc-helicon.com/voicetonesynth.asp