"...keyboards and put rocks on the keys to keep the notes playing!!! ..."
Ha ha I remember in the late 80's being technologically inept using a small wedge made from a cloth pin ...it was easy but hard physically and electronically on the board, a D-50 I believe. I think as it had problems after that with the after touch getting all wonky 'till it crapped out.
Try to avoid those rocks if you can.
Boss makes this foot FS-6 switch.
This is the description Boss provides .
"Two switches in one, Boss's new FS-6 combines latch- and momentary-type switching into one unit.
With two switches conveniently housed side-by-side, the FS-6 allows each switch to be set for latch or momentary operation.
Pick the configuration that best suits your playing style and setup."