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Superior, noise-free guitar effects pedals are the result of superior design and construction of the circuit, and not whether you use an aluminum case versus a polycarbonate case. My effects are quiet even before I put them in the case. This Demo shows that an aluminum case (whether or not the circuit is grounded to the case) does little to prevent radio waves from entering the case. Choice of case, be it aluminum or polycarbonate, is best left to esthetics, and to the personal preference of the user.