Well... The problems with my SD3 from day 1 over 2 years ago, still there, no help from Ketron Italy despite repeated requests are:
1) If I use the lead effect of Overdrive, all left volumes (bass, drums, accompaniment) become constant and sometimes abnormally loud, and no longer controlled by the volume pedal. Right hand lead continues to be controlled by the volume pedal as expected.
2) When using the WAA-WAA effect, the left volumes again became constant just like the overdrive, and the WAA-WAA effect is controlled by the pedal but the volume increases way up, ABNORMALLY LOUD, I mean really unusably loud.
3) When I use the Distortion, all volumes were controlled by the pedal but the right hand volume went abnormally high, again unusably loud.
4) The Power Guitar voice (I think that’s the one, when checking I found it was using distortion, evidently automatically set) right hand volume was abnormally high. I realize this particular voice is supposed to be powerful, but not this much.

After communicating with AJ, Ted, Jay Salam, and Ketron Italy over 35 times over 2 years with no answers, I have pretty much given up on Ketron. Thankfully, those effects do not have to be used by me in my playing. However, it has been a problem since new, and a unit should work properly. I stand by the caveat "Let the buyer beware". Products should be thoroughly tested before release. Ketrons track record in this regard is, in my opinion, incredibly bad.