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MAX9768 cannot MUTE

Category: Hardware
Product Number: MAX9768


I have implemented MAX9768 for voice guidance on a microcontroller board PC that I designed.
When I connected a speaker and input voice data, it was able to speak.
The volume is controlled by I2C, and the MUTE pin is also connected to GPIO for control.

Even if this MUTE pin is set to high level, the volume is reduced, but it cannot be completely muted.
The same is true when the volume data is minimized via I2C.
Is there any possible cause for this?