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Alsa Control for ADC in DAC+ ADC pro

Hi,
I hope that questioned is not too stupid. Can you point me to information how to change Bitdepth or samplingrate or input gain via Alsa for the ADC? It sounds ok now being connected to a phono preamp, but a bit weak, hence I like to increase gain, and see if a sampling rate change would yield an even better quality. I am working with Volumio and would need to manipulate Alsa directly. I am confused if the Alsa mixer allows ADC Manipulation (as it seems to be doing on-the-fly for the DAC portion) or if this needs to be done via arecord which might not work with Volumio.

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