That is a good idea. I can think of a variety of characteristics that could be compared… height, freq of sweep, controls. (EP-3 has a control for the frequency range), sweep mechanism (older Moogs had a piece of string, Korg has a cog).Hmm, maybe an expression pedal shootout is in the future. I really like the Moog with the Xerograph as well as the Spaceman Explorer, but I can see how a smoother sweep would be desirable.

