I have it working pretty good now. I think the speed can't change. Maybe the tilt thing on the ipod only works so fast. For anyone wanting to try this. I have just used an XY pad sending midi to Jamup using Apollo bluetooth connection between ipod and ipad. I can sit the ipod in the top of my foot using an elastic and when I move my foot up and down it controlls the wah pedal with a pretty good feel. Fast movement of the ipod up and down is a little slow to respond but it might be the ipod , not midi designer. I could control anything in Jamup or amplitube this way. One more thing, I find it a little quicker using the Y controller instead of the X and sitting the ipod sideways on the top of my foot.