Hello there A pedal won't work properly with more or less power. An adapter that has a daisy chain connection will send 9 volts to each pedal. The problem is the grounding.
Not all pedals are grounded the same. Some are center grounded and others are not. Check your pedals to see if they are compatible to the adapter.
If not, do not use it because it will wreck your pedal. Later.
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