Gateron Magnetic Genty Semi-Silent HE

Yes. It's a magnetic Hall Effect linear, so it needs an HE-compatible board to read the analog magnetic signal. It will not work in a standard mechanical PCB wired for metal-contact switches.

Silicone mute pads sit on the top housing where the stem makes contact on the upstroke, damping the top-out clack. The downstroke bottom-out is still audible, so it quiets the return rather than fully silencing the switch.

On an analog HE board, yes. The switch ships with a free-setting pre-travel, so you set actuation and rapid-trigger behavior in your keyboard's software rather than relying on a fixed mechanical point.