I found 'Serial Output route Control' parameter on Sound Engine Setup page was the case of this. It seems that for 'Stereo' Chan/Frame parameter in Digital Setup 'ADC to Engine to Serial Output' option should be selected. Currently I don't have HW to capture i2S stream however on the scope it still looks like data does not correlate with the analog signal.E.g. ADC gain control does not change how output looks on the scope.
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