Ive recently discovered that my soul food and preacher have a very slight vibration in them when i plug in the psu, it stops when all my pedals are connected to each other and back to the amp .it seems to only happen when i use the two stagg 9v center neg psu that are for guitar pedals . Is this somthing to worry about or am i damaging my peds.by the way i don’t have it in my deluxe memory boy with a boss adapter