Quote:
Originally Posted by Vancebo
I believe phase issues can only happen between two or more sound sources. Like a guitar top and speaker. Phase button is a tool to possibly help when feedback is present. It is not caused by a piece of gear.
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Many pedals do reverse phase. Just like the phase button you mention does. So if the levels are set based on a certain reaction between top and speaker and that relationship is reversed, feedback could be the result. Also time based pedals often change levels between the bypassed and non-bypassed positions even with controls at zero. It is certainly possible that even a small boost from the pedal is enough to push you over the edge.
hunter