ELECTRO HARMONIX BIG MUFF OP AMP - #7805277 - su Mercatino Musicale in Pedalini Singoli per Chitarra
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Electro-Harmonix - The EHX Op-Amp Big Muff Pi is famous for its "huge, crushing Big Muff sound with more crunch… great for grungy, wall-of-sound distortion, heavy rhythm playing and heavy leads."