I just bought an M-Audio Keystation 88ES. I have a used Behringer expression pedal. The pedal works fine in the sustain input, but when I insert the jack in the volume input it cuts all power to the unit. When I pull it out, power comes back on. Is this a fault with the keyboard volume input, or with the pedal, or do I need to configure something? Thanks
Music - M-Audio - M Audio Keystation 88es 88 Key USB Midi Controller
Answers & Comments
If the power goes off when you plug in the pedal, the pedal LIKELY has a short in it between two of the three connections at the plug.
Firat, try putting the pedal plug in BEFORE applying power.
Likely the pedal presents a pot or volume control that will have like 5 volts across it an the wiper returned on the same cable. If the wiring configuration is wrong OR if the plug goes through a period of shorting the 5 volts out during insertion that will cause a problem...
To troubleshoot, move the pedal to half way and these with an ohmmeter for shorts between ANY two of the three connections.