Sliders and knobs are one thing, but this format really invites the use of XY controllers where sliding a finger in the x-dimension modulates one parameter, whi

Sliders and knobs are one thing, but this format really invites the use of XY controllers where sliding a finger in the x-dimension modulates one parameter, while the y-dimension modulates another. I am certain more complex schemes should be possible, especially given the possibilities of multi-touch input. I would love to see something like this included.