What keyboard are you attaching the pedals to? As an example, I own a Kurzweil PC3, a highly professional keyboard, however the keyboard does not support a three pedal sustain pedal. The Forte model does but the PC3 model does not. So perhaps the keyboard that you are plugging it into does not support more than one sustain pedal. Just because it is a Roland pedal doesn't mean that it is compatible with every Roland keyboard.