The "modern" and "vintage" vibrato modes both leave the Xnob unused…that's a waste of a perfectly good knob that could really spice these two effects up. I think the Xnob should control a lo-fi filter, to emulate the trebly victriola warped vinyl type sound that you get with other vibrato pedals such as the EHX Clone Theory and Zvex Lo-fi Junky. More pitch range is also needed in the depth control, it should be able to go like an octave up and down for really deep and extreme vibrato. I realize that I could do it with the Pitchfactor pretty easily, but this is the official vibrato pedal, so, yeah. Needs more pitch.
