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How to disable alsa's Loopback Mixing by default?

gb flag

On Ubuntu 20.04

Sometimes it happens that the speakers emit an annoying sound when booting. I can solve with:

amixer sset 'Loopback Mixing' Disabled

Saving the settings with:

sudo alsactl store

The same is true if I launch alsamixer and disable the Loopback Mixing. When I restart the Loopback Mixing is enabled. How can I disable it so that on the next boot the Loopback Mixing is disabled?

Thank you all, both if you read and reply :)

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