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M-Audio EX-P Expression Pedal – Thomann United States
Amazon.com: M-Audio EX-P | Universal Expression Pedal for Keyboards & SP 2 - Universal Sustain Pedal with Piano Style Action For MIDI Keyboards, Digital Pianos & More : Everything Else
Proline Universal Expression Pedal With Polarity Switch And Minimum Depth Knob : Target
Daisy-chaining a MIDI expression pedal with a footswitch for added capabilities - YouTube