similar to a drum, the empty space inside the case acts as a resonator and most of the dampening options try to fill in the space – EDIT: reminder that whatever you use, make sure it’s non-conductive
- initial sound generation – silent switches, no long-pole stems – reminder that switches generate as much sound on upstroke as downstroke
- dampening the plate response – burger mount, gasket mount
- empty space between plate and PCB – most commonly filled in with laser cut Poron foam (“plate foam”)
- empty space in case under PCB – filled in with a whole range of materials
- most common currently also laser cut Poron foam (“case foam”)
- early experiments with rubber shelf liner, Sorbothane (automotive audio dampener), and Poly-fil all with good affordable results
- high-end DIY includes silicone pours – filling up the bottom of the case with silicone and letting it set in place (how-tos on Youtube)