It would be cool to have modes for how the master filter knob works. A new inverted mode would make one of the filters have an opposite direction. So increasing the master will increase the frequency of filter 1 but decrease the frequency of filter 2 simultaneously (obviously using negative values on the master knob would achieve the opposite). This would be useful not only for a creative performance macro but also when using a combo of HP and LP, where the knob would make the 2 filters converge and diverge, making a sort of adjustable bandwidth BP.