| In most cases, you'll fry your pedals. Most 9VDC pedals won't be able to handle 12VDC. They're not often built with components which are rated for significantly higher voltages.
There are some that will, however, especially in the realm of boutique effects where better components are used. Always check with the manufacturer to be safe. If it's a major brand like Boss or Ibanez or EHX, don't risk it - they most likely can't handle 12VDC.
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Bassist for Vernian Process
Founder of the Lefty Union
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