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Your cart is empty.It took a lot of testing and experimentation to find just the right combination of components to give a nice, audible tone control to a disk piezo circuit. The circuit works in the same way as standard electric guitar tone circuits - by shunting more or less of the signal through a capacitor, more or less of the high-end treble is "rolled off" to ground. This lets you adjust how much treble sound reaches the amp. Rolling off at least some of the highest trebles can really help tame a disk piezo, making it less "scratch", "tinny" and feedback-prone.
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