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GPIO pin to mute the Amp+

I read somewhere how to mute the Amp+ using one of the GPIO pins.
Can anyone please give me a hint?

What are the GPIO pins used for ?
BCM 2: I2C Data
BCM 3: I2C Clock
BCM 18 (Pin 12): ?
BCM 19: ... ?
BCM 20: ... ?
BCM 21: ... ?

Thanks in advance
Dirk

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