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Try plugging in the pedal with the Roland powered down or off. With the pedal plugged in, turn the Roland on again. The Roland should sense the polarity upon power up. If this doesn't work, I have had those pedals get defective right out of the box, so try this...Get a ¼ inch guitar or signal cable and plug that into the damper jack. The cable will represent an open circuit polarity since nothing is shorting out the leads. See if the EP77 is sustaining or if it is not. Alternately, try shorting the guitar cable by laying a piece of metal across the top and bottom of the jack. A pocket or kitchen knife or any bare wire will do. If this does not work, your assumption about the power supply may be correct.