When I plug the damper pedal into my Roland ep 77 the damper comes on and stays on no matter if the pedal is pressed or not pressed.

I can't! In my opinion, no. Start drift boss customize your car by choosing different colors and patterns.

every sustain pedal got different polarity.. normally just go to global setting on your keyboard and change damper polarity setting to plus or minus (select which one work with your sustain padle).

Sorry, but the Yamaha pedal has the opposite sense (it is a normally open contact) than what is REQUIRED by Roland equipment. Roland requires a Normally Closed contact. Unfortunately, one is confused because the Roland jack for the sustain shorts itself to no sustain when you unplug a pedal. SOMETIMES one can open a pedal and with soldering iron change a wire to reverse the pedal sense IF the particular pedal has both contacts available.

Look for a setting "pedal polarity" someplace either in the software or in the units.

Read section 2.4.2 of the Axiom manual. Also Appendix E where sustain is documented. The sustain is controller 64. I would use method 1 of the 2.4.2 writeup. You actuate the control (pedal) which arms the unit to accept setup sequence for that particular input.

You want to turn on MIDI output for the sustain pedal. Now remember that a Roland pedal has revese polarity of MOST others and that may needs to be setup. It is NOT clear from the documentation if the Axiom recognizes the reverse sense of the pedal, but it should. It SHOULD sense the pedal is normally closed and when you actuate it sense the change so you can configure it.

Some of the software MAY try to configure the Axiom and ASSUME the pedal is the more common polarity and undo the programming you have done.

I assume you are plugging this into a ROLAND brand product as the Roland sustain uses a normally CLOSED contact while MOST other brands use NORMALLY OPEN contacts.

The Roland synths now monitor the pedal as the power is turned on and supposedly decides which contact type is used.

Remember that for MANY voices, such as piano, notes are held longer BUT they do not continue indefinitely just like the sustain on a real piano works. On a real piano the dampers are lifted, but the strings eventually stop ringing due to the losses of energy in the strings.

Some voices will be held,such as organ tones.

I don't have enough information from your post regarding what voice you are having trouble with.

1.Make sure you are plugged in to DAMPER (not FC1 or FC2) 2. Check to see if the notes STOP sustaining when you PRESS the pedal. If that is the case, first try turning off the Roland with the pedal plugged in and restarting with the pedal pressed down. 3. Press the EDIT button and scroll to Damper Polarity. See if it's set to Standard or Reverse. 4. If problem persists after all that, try holding the pedal jack into the Roland at different angles and then try the same with where the cable connects to the pedal. At that point, you can either attempt to repair the pedal or get another one.
Hope this helps, Stewart

Please note that ROLAND equipment USUALLY uses Normally closed (electrically) damper pedals for their equipment. Most other brands use normally open ones. If you are using a non-Roland pedal, that is likely the problem.

SOME PEDALS require opening and changing a wire (involves soldering) to match the unit you are plugging into. A very few have a switch on them to allow changing polarity.

A few synths, like the Yamaha Tyros have a built in setup screen where one can select the polarity of the attached pedals.

CLOSED is typical for Roland pianos when at rest. (open to sustain).

Note that the jack PROBABLY has a grounding contact so when no pedal is used/plugged in, the jack is shorted at the piano.

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"

I'm 90% sure the pedal is shot ... It could be the switch ... Open the thing up (If your confident) and look to see if a wire has come loose ... If no wires are loose then try another working pedal with the keyboard.

If it still won't damp then there is a problem with your keyboard and I do not suggest opening up one of those ... I used to repair sockets and keys on those for a local boys school and there are full of things that can break if not opened properly,

My suggestion is getting someone in to repair the keyboard if its that ... If its the pedal then either get a new one if you don't want the old one repaired ... Or repair it yourself (pretty easy if its the wiring ... fiddly if its the switch but only attempt if your confident and have the proper tools).