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Maestro was in possession of a tuning fork, which possessed seemingly magical properties.
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Maestro used their tuning fork when The Doctor emitted a sonic sound using his sonic screwdriver to find him. They found him by putting the resonating tuning fork in a nearby puddle, drowning out and cancelling the sonic noise, making the Doctor and Ruby findable. (TV: The Devil's Chord [+]Loading...["The Devil's Chord (TV story)"])