#1
Ok so I have 2 Digitech pedals, the Grunge distortion and the multi-chorus. I was wondering if it is safe to use a power adapter that is higher than 9 volts or an adapter that is lower than 9 volts.
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#2
it's safe to use a lower one but it might not properly power the pedal
higher might damage it
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#3
Umm... If it less, it will be really quiet. If is more, it will probably overheat. Not 100%, but probably. Proprietary ones are quite cheap.

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#4
In my experience, if you use a lower one, the pedal will not turn on, period. and a higher one will eventually fry the shit out of it, i had the same delima and tried a 18 volt and after only 10 minutes of playing, there was smoke rising from the pedal.