I have an H90. I have two spots left on my Fender Engine Room power supply- one is 9v500mA, the other is switchable so I can also get 12v375mA. Can I combine 9v500mA with 12v375mA, or would it be better to combine 9v500mA with 9v500mA? Does the pedal sound better at 12v than it does at 9v?
