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Dac + Pro bias voltage

Hi

I m using this soundcard with a Pi Zero and Arch with an uptodate kernel.

Following the datasheet I did:

dtoverlay=hifiberry-dacplusadcpro

The card is recognized. To enable bias voltage (software side) I do:

amixer sset "ADC Mic Bias" "Mic Bias off"

This gives:

amixer: Unable to find simple control 'ADC Mic Bias',0

Thoughts on why, and how to proceed would be great.

Thank you,

Grant

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