I just picked up a Digitech Talker pedal for $10. It worked when I bought it, but when I got it home it doesn't seem to like my Voodoo Lab Pedal power. It turns on, but doesn't function correctly; lights come on, and some flicker. It requires 9.75 watts, 820 millamps. Is voltage flexable? I seem to remember hearing that a 9v powersupply is not exactly putting out 9v all the time; it varies. So I guess my question is this: do I actually need the exact 9.75, or is my pedal just broke?