Ny way to control volume on ISD1600B

audio

I'm using the ISD1610B chip and I would like add some volume control on the Speaker/Buzzer or on the optional speaker.

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Can I add a potentiometer at the SP+ or SP- line? But wouldn't that only let me go down to 1/2 volume since it is a differential output? Any other suggestions?

EDIT:
I'm looking to adjust the volume of the speaker used for playback, not the input volume from the microphone (this can be adjusted using the AGC pin as Leon pointed out below).

Best Answer

Varying the voltage on the AGC pin should do it, according to the data sheet. It will vary the microphone amplifier gain.

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