How do you make the sustain pedal work correctly? It now works in reverse and none of the pedal options will correct the problem.

I would suspect the sustain pedal jack on the keyboard is either dirty or defective. Try using some contact cleaner first, and if that doesn't work replace the jack.

Your pedal may be the wrong polarity for this keyboard. Different manufacturers wire differently. And some use trs 1/4" and others use ts 1/4". Contact Yamaha customer service to get the correct pedal for your instrument.

Buy sustain pedal made for CASIO or switable model.
Pedal for Yamaha or Roland will work in reverse on a Casio.
If you cannot return for exchange, then open up and solder a different type of micro switch.

Is this the correct sustain pedal for this unit? It sounds like it should be a momentary button type. I would look into that. Some have a push to work type of switch and some use momentary. If it is, I would open that pedal and clean the switch with contact cleaner, as it appears to be sticking.

You should have a setting on the keyboard which allows you to switch pedal control. Check the manual.

Roland requires a pedal that is normally closed, open sustains. MOST pedals work the opposite. SOME pedals you can open and rewire... but not all can be.

Yep!!! Happens all the time and only a few synths have the option of selecting the operating mode.

NOW if you can open the pedal, USUALLY the switch has both the Normally Open and Normally Closed functions that a single wire can be moved to reverse the operation.

USUALLY you will need a soldering iron to make the change.

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.

There are two types of damper pedal switches, on that is closed until you press it, and one that closes when your press it. It sounds like your Casio is expecting one type and your Roland pedal is the other type. A quick way to test this is to plug a guitar cable into the Casio pedal input and see if the keyboard sustains. If it does, then your Casio requires an "normally closed" switch.

Some pedals have a small switch near the cord or even on the bottom of the pedal that will reverse the switching operation (BOSS pedals, a division of Roland, have this feature). If you can find that, then change the switch position and you should be OK.

If not, and you feel like digging into your pedal, you could take the bottom off of the pedal and check out the switch itself. Many pedals use a switch that can be used either way. The clue will be on the switch itself. If there is an extra tab on the switch that is unused, then switch the wire that is furthest away from that tab to that tab. This will probably involve soldering, but it is nearly impossible to damage anything.
If moving the wire that is furthest away does not do anything, then try putting that wire back and switching the other one.

If your pedal does NOT have an extra tab, you're SOL, unless you want to buy a replacement switch (unsure of make). If this is the case, you are probably better off getting a different damper pedal - preferably one that is marketed as "universal"

Not if its like mine, its a completecircuit vs.incomplete circuit problems.

I had the exact same problem with my Casio keyboard and a Yamaha sustain pedal I bought.

I'm not an electrical genius, but I was able to get it to work by opening it up and doing a little modification. Of course I first just tried switching the white wire with the black one but that didn't change anything at all when I tried it. It turns out the Casio wants the circuit completed to sustain, and broken for no sustain, which is the opposite of what the Yamaha pedal does.

I opened it up and mine had three three flat metal strips let's call them Top, Middle and Bottom. The Middle and Bottom ones were joined together on the right side, and the Middle and Top ones were touching on the left side when the pedal was not pressed. These seperated when the pedal was pressed, thereby breaking the circuit because the wires were on the top plate and on the joined Middle/Bottom plate.

So to flip it I:
1. Unsoldered the Bottom wire
2. Cut apart the Bottom and Middle plates on the right.
3. Bent the Middle plate on the right to touch the Top plate instead and soldered those together.
4. Soldered the Bottom wire back on.

That's it! Once I figured it out, it took only a few minutes to fix.
Good luck!
Paul