The biggest difference you would notice right away is the taper in the gain control. The old ones were bunched up at the end. The new ones are spread out and have a even progression to the max gain setting. It also has a better note decay to my ears because of the way we configured the new gain control. Tech terms, we shunted 100k off the input signal to ground which helps with the decay and a smoother feel. I think this version cleans up even faster on the guitar volume knob because of the input signal being padded down now.