This Pedal is currently available.
Expression Pedal
https://www.thomann.de/intl/maudio_expression_pedal.htm
Included in 2 Pedalboards, 1 are public:
M-Audio M-AUDIO Expression Pedal EX-P -
M-Audio EX-P Universal Expression
M-Audio EX-P Universal Expression
M-Audio EX-P Universal Expression
M-Audio EX-P Universal Expression
M-Audio EX-P Universal Expression