Reply to 1/4" Jack in MFP

I've seen a few videos of Ean rockin his Custom Midi Fighters with a 1/4" jack. He plugs a footswitch into it to toggle record with his foot.

http://youtu.be/YR-1Oe06YLw
(read the comments)

I just recently saw another video of him rocking a MFP and it looks like it has the same mod.

http://youtu.be/ERl_-5IcHHA
(Notice the 1/4" cable sticking out of it?)

So how would one go about this mod if the midi fighter can only have an adittional 4 analog & 4 digital inputs? He seems to be using the cue master. Correct me if im wrong but I thought the cue master used up all it's inputs?