This Pedal is currently available.
Expression Slider
100k Pot
https://shop.mas-effects.com/products/expression-and-volume-slider?variant=40752969908385
Included in 3 Pedalboards, 2 are public:
MAS Effects Mas Effects Sona Fuzz Pedal
MAS Effects The Expanse
MAS Effects The Expanse
MAS Effects The Expanse
MAS Effects The Expanse - Harmonic
MAS Effects Mimir’s Well