My keyboard sustain now has reversed polarity on random occasions...have tried everything, and it's not my pedal because the same things happen with different pedals.

First you need to make sure that the keyboard is programmed to accept the DP-10 as factory default and then that the DP-10 is working perfectly. There is a case where the DP-10 action switch is activated directly, in this case the sustain does not stop and you need to change the micro switch of the DP-10 pedal. It has already happened to me and I replace it by adapting another micro because Roland does not support you and wants you to buy another DP-10.

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.

Since you didn't specify the model of the Yamaha I will take a good guess. MOST keyboards of all types default via their internal programming to use a pedal that is either a close circuit or open circuit switch. Basically it is two contacts from a wire that is connected (closed) or normally not connected (Open). When you press a pedal, the contacts either open or close. Your pedal has a switch that can choose either one. Now,.. the keyboard has some internal software that controls how the keyboard "sees" the pedal. It sounds to me that you have to get into the "control" section of the interface on the Yamaha and scroll to the "Pedal" polarity section. You might see it as a - (minus) or a + (plus) icon. See if you can make
one of them a default every time you power up. You see, every time you power up the keyboard, it is sensing something different. One last thought... or question...are you keeping the sustain pedal plugged in? or are you connecting and reconnecting it? The keyboard usually "remembers" or senses the polarity from the last power up. I have had similar issues with the Motif keyboards from Yamaha, but have remedied the issue by digging into the internal controls. Lastly, search the manual that came with your Yamaha. See if there is a section under Pedal or pedal polarity.

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

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).

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.

This is confusing... you say "the sustain works when you disconnect the cord"? How can that happen? and doesn't work when it is plugged in.

MOST sustain pedal problems are due to people using a different pedal than the keyboard is designed to use. It is very common that someone tries to use a Roland sustain pedal on a Yamaha and oof course it doesn't work because the Roland pedal is normally closed and Yamaha usually requires a normally open contact.

A FEW keyboards now check the state of the pedal input when power is first turned on and configure the pedal polarity accordingly. For these keyboards, make sure the pedal is plugged in before power is turned on.

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.

I have the same problem, But I have been using the same pedal since new. Infact it came with this pedal. Then suddenly it started doing this. Could I have changed soem setting by accident?

What I figured out is that when i turn on the keyboard, if i hold down the pedal by accident, it will work in reverse. I dont know if this is what you mean. If it is, just dont touch the pedal when you turn it on. If it isn't, try to return the pedal. I dropped one, it had this problem, and they gave me a new one. Your cord for it might have been bent (?). Also, turn the keyboard on with the pedal already plugged in. It's not made to be plugged in while it's on. Hope this helps. - Matthew