Some pedals have a switch to change the polarity. If not it is possible to make a patch cord that will do the work. This link will start you in the right direction.
http://www.pacificcable.com/Custom-1-4-Inch-Cables.html
SOURCE: Ensoniq KT-88 - sustain pedal works opposite the way it should
Usually that indicates that the polarity of the jack for the sustain pedal has been switched or someone has substituted another pedal with the wrong polarity. Try looking in the manual to see if that is an editable parameter for people who might not be able to obtain an original pedal. You may have to initialize the keyboard which is on page viii of the manual. The jacks on the back for footswitches are on page 1 and 2. The footswitch settings are on page 9. I found the manual here:http://soundprogramming.net/manuals/Ensoniq_KT-76_KT-88_Manual.pdf I don't know if you have the single footswitch or the optional stereo footswitch. If it is the single footswitch, the default setting should work correctly if it is the original SW-2 or SW-6 pedal switches. If it is the optional SW-10, the FTswL setting should be Unused. Hope this helps.
SOURCE: When I plug the sustain pedal in, it remains on
Try testing your switch for function by testing it with a volt ohm meter to make sure the cord and switch are functional. In this case if it is the recommended foot switch it will be momentary on or off. That is if you are using your meter to test across the plug, when you press down you should have no resistance displayed if there was resistance when you connected the probes or resistance displayed if there was none when you originally connected the probes. If the switch is good, your problem is internal to the keyboard and you will have to troubleshoot the circuit on the board. Another possibility is the solder joint has failed where the sustain pedal jack is mounted or the jack itself has failed.
SOURCE: Sustain Pedal Opposite Effect
I found that if I plug in the sustain pedal BEFORE turning the power on, it works fine. If I plug in the sustain pedal AFTER turning the power on, then it works in the opposite way. Probably just the design. So I would try playing with that before doing anything drastic.
SOURCE: I have a Casio CDP
You should have a setting on the keyboard which allows you to switch pedal control. Check the manual.
SOURCE: I replaced sustain pedal jack...now sustain is on ALL the time, even with pedal unplugged
When you replaced it, you either have the wrong jack, wired it wrong or it is shorted out where you connected it. Recheck the connections.
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