ISOLATE
If you consider your pedal to be abnormally noisy, make sure your power supply is isolated. The symptoms of using a low-quality and/or non-isolated power supply can include, but are not limited to: switch pop, hissing, white noise or other strange noises. In addition, “dirty power” in whatever room, house, lounge or venue you’re playing at could also affect your pedal’s performance. For more info on the importance of clean power you can also refer to this article published in December 2011 by Premier Guitar Magazine titled Powering Your Board. Lastly, other issues that may produce noise in pedals are single coils in the “in phase” positions, standing too close to your amp, or having many high gain or boosting pedals on your board.