Foam is a PT2399 delay where you control time by applying pressure.
This idea was something I tinkered with quite alot as soon as I had started manipulating PT2399 chips in fun ways. The hard part was coming up with a implementable design for a proper pedal with the means I had at my disposal.
After a ton of failures I finally landed on the two 3D printed shapes and some furniture paws. It made it feel just foamy enough to be satisfying to play with. Very tactile!