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This commercial for Tronical Tune seems like it could have been cut directly from Back To The Future. The device tunes a guitar completely by itself, the same way an automatic transmission does all the gear shifting for the driver. Andy Williams of Every Time I Die demonstrates the ease of the self-tuning device by simply setting his guitar to drop D tuning, and watching as the servos automatically and exactly twist and tighten the guitar strings for the perfect sound. Guess and check tuning will soon be a concept of the past.