Midi sustain pedal reversed after first use : r/midi
If Your Sustain Is Pedal Working In Reverse, This May Be Why
Amazon.com: Sustain Pedal for Keyboard - Sovvid Piano Foot Pedal with Polarity Switch for All Brands Electronic Keyboards, MIDI Keyboards, Digital Pianos, Yamaha, Casio, Roland, Korg, Behringer, Moog and More : Musical
If Your Sustain Is Pedal Working In Reverse, This May Be Why
Electronic Piano & Keyboard Universal Sustain Pedal Reverse Polarity [EU stock] | eBay
Crumar CSP-40 Sustain Pedal | Sweetwater
About the polarity of the sustain pedal | Sound House