I made my own two button (momentary) external switch. With my setup I use Switches 1 & 3 hold for preset inc/dec. Switch 2 hold gets me the tuner. Switches 1-5 tap give me scenes 1-5. Gives me 1 row w/equidistant taps to my scenes. I use one preset per song. With 5 scenes and 4 channels to custom configure per song, one preset can cover a lot of ground. Yes....there are cutouts in the sides of my switch box to allow free air flow into the FM3. All gear is 2" velcro attached. Board has latching top cover with feet, carry handle and matching ichthys (fish). Board/top coated with rolled-on deck coating. Very tough durable coating. Yeah, it is kind of 'dukie brown', but I like earth tones.
View attachment 66659
I like how you keep the plastic film on the display but heavily modify the unit nonetheless.