Electro-Harmonix have just announced a new pedal called the 8-step program. More details here.
I'm thinking this could be plugged into the expression input on the Factor pedals and used to automatically control the knobs. I'm assuming the pedals would be programmed in the same way we would currently use the expression pedals. What do you think? There's no manual available yet. I'm not quite sure how you'd map this to create arpeggio's at specific intervals though for example using h9101 on Pitchfactor.