At first glance it seemed too weird to be true but looking at the looping gif in the link below, it seems that you can control the foot pedals on the iPad screen via "cables" that somehow adhere to the screen. Pretty amazing.
Click here to see more.
<a href="http://webeecho.bandcamp.com/track/pristine" data-mce-href="http://webeecho.bandcamp.com/track/pristine">Pristine by we be echo</a>
<a href="http://webeecho.bandcamp.com/track/under-my-skin" data-mce-href="http://webeecho.bandcamp.com/track/under-my-skin">Under My Skin by we be echo</a>
<a href="http://webeecho.bandcamp.com/track/falling-binaural-horned-mix" data-mce-href="http://webeecho.bandcamp.com/track/falling-binaural-horned-mix">Falling (binaural horned mix) by we be echo</a>