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DAC2 Pro: Disable individual headphone volume

Hi,

I really like my new DAC2 Pro so far. However, I'd rather prefer to have the headphone volume (Simple mixer control 'Headphone',0) always stay in sync with or control the overall volume (Simple mixer control 'Digital',0) using alsamixer or disable the individual headphone volume control altogether.

Is there a way to achieve this using the command line and make it stick via boot parameters or asound configuration?

OS: HifiBerryOS 20210531 on Raspberry Pi 4

Any help or hints would be appreciated!

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