There are two types of sustain pedals. One type works properly with some keyboards, the other type works with all the rest of the keyboards. In the past, if you chose the "wrong" pedal, it would work backwards, sustaining when NOT pressed. The UMX keyboards are compatible with both types of sustain pedals. It is easy to setup. With your UMX keyboards this is not a problem. You won't believe how easy this is to set. 1. With your UMX keyboard OFF, connect your pedal. 2. Turn on your UMX keyboard. 3. Press your pedal once. You are set to go!