r...@sdf.org (RVP) writes: >Perhaps the correct ADC was not selected? See Section 10.6.1 in the Guide[1].
If I follow this and use "all available sources", I get twice the amount of data, the sources are interleaved in the input stream. hdafg0: ADC02 2ch: Mic In [Jack] hdafg0: ADC03 2ch: Mic In [Built-In] With record.source=ADC02,ADC03 this records 4 samples ADC02.left, ADC02.right, ADC03.left, ADC03.right per frame. But audio(4) doesn't know about it, as the hardware sends data at twice the rate, the result sounds like a half-speed recording with half the volume (when one input is silent).
