Available as an assembled Module and as a DIY project.
No info about availability.
Dual Foot Controlled Expression Module
The MST Expressor allows you to use expression pedals with your modular, taking a "hands-off" approach to expand your control and creativity. It has two identical powered expression pedal processing units in one handy module, allowing you to do things such as:
Features:
http://www.synthrotek.com/products/mst-eurorack-modules/mst-expressor/
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These merchants probably sell this module. Huh?