M-Audio Sustain pedal not working
I have Garageband, iMac and iRig Keys i/o 49 I have just bought a m-audio SP2 sustain pedal and I don't know how to get it to work, I plugged it in to the keyboard but nothing happens. I tried with keyboard both on and off.
iMac 21.5″ 4K, macOS 10.15