Yeah, on the board. It's got a thin wire so you can run it wherever. I keep it hooked up to the timebender.
It's trailing off the edge of the picture here:
He can make them with different resistances so it can match whatever you need.
As you step harder, it's like either going toe-down or toe-up on an expression pedal, depending on how it's made. (Not adjustable, that I know of.)
It's tough to get precise inbetween settings but when you're going between toe-down and toe-up extremes, it's good. If you've got a primary setting you like on the M5 and a different setting you like to switch to momentarily, it should work.