Advantech EH-7104G Si Manual page 10

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The Address Mapping and the allowable range of content for the control
registers are shown as in the following table:
These Control Registers control mainly the internal Mixer functions of
the Audio Codec. To configure the paths of the audio signals, AP must set
up the switches of Mixer inputs and outputs via control registers, 3C, 3D
and 3E. To get optimized loudness of the voices from different sources,
the control registers, 30, 31, 32, 33, 38, 39 and 3A must be set to suitable
values.
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EH-7104G Guide ver 1.doc 10 of 10 05/07/20