Phase 4 is this:

I'm basically planning to replace the resistor with a pot of same/similar value, replace the pushbutton with a footswitch and rehouse the whole thing.
Am I missing anything silly here? Will I find a suitable housing? Will I stab it with pliers and throw it out my window? TUNE IN FOR THE NEXT EXCITING EPISODE!
 
				  






 ..unless I can lay my hands on a 4th RAT knob..
 ..unless I can lay my hands on a 4th RAT knob..





