I used my SVT for many years, then my SVT3PRO. For the last couple of years, my main gigging rig is a Fender Rumble 500 and 2x10 ext cab. It's much easier on my back. Reported reliability problems kept me from an Ampeg combo. The Rumble sounds nice, but I miss the SVT magic. I used to just push in the ultra low, turn up a little bass and treble, and I got a perfect tone. I've been playing with this thing in my living room, with my Rumble 40. I usually use the Rumble with the contour and vintage buttons in, and a little bass and treble. But, I'm not having much success working this pedal into the mix. I'm considering sending it back. Does anyone have experience with these? Maybe I'm expecting too much, trying to get an SVT tone out of a Rumble.