I just bought a used Xotic RC Booster that looks like new inside and out. After putting a new Energizer 9v in the pedal, I noticed that the unit generates a ticking sound through my amp. I was playing in my spare bedroom office with the ceiling fan turned Off. I've never heard a similar pulsing/ticking sound through my equipment before. Even 6 years ago using a Zvex SHO there was no extra noise. Is this noise common for the Xotic pedals?