alsa-utils/speakers


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#!/bin/dash
amixer -c "${MAIN_ALSA_CARD}" -- set Headphone '0%' mute
amixer -c "${MAIN_ALSA_CARD}" -- set PCM '100%' unmute
amixer -c "${MAIN_ALSA_CARD}" -- set Master '100%' unmute
amixer -c "${MAIN_ALSA_CARD}" -- set Speaker '100%' unmute