This Pedal is currently available.
Expression Slider
100k Pot
https://shop.mas-effects.com/products/expression-and-volume-slider?variant=40752969908385
Included in 6 Pedalboards, 3 are public:
MAS Effects Mas Effects Sona Fuzz Pedal
MAS Effects The Expanse
MAS Effects The Expanse
Fairfield Circuitry MAS Distro
MAS Effects Tiny Fuzz: Charging
MAS Effects Tiny Fuzz: Drunk Dead