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BEIGEL Sound Labs Mu-FX Tru-Tron 3X, it’s a rare gem, designed, built, and signed by the legendary Mike Beigel himself. (original box not included), but comes with a power adapter and original paperwork. This unit is in very good working condition (See Photos)This pedal is more than a nod to the past—it’s a modern masterpiece, evolving from the original Mu-Tron III envelope filter that was beloved by Stevie Wonder, Jerry Garcia, Bootsy Collins, Frank Zappa, Carlos Santana, and many other musical legends. The Tru-Tron 3X is the closest thing to the original because it is the original, in essence—just refined and better than ever.Not only is the Tru-Tron 3X the best envelope filter for guitar, but it’s also exceptional for bass, keyboards, sax, or any instrument you can plug into it. Versatility and vintage mojo, all in one.