Sound configuration on Raspberry Pi with ALSA
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This shows the maximum and minimum values for the playback volume and that it is actually a pair of values for left and right channels. The operating system saves the ALSA sound configuration when you turn it off and restores it when you turn it on.
The state is stored and restored using this file: Once you have the sound configuration as you want it you can store it there using the alsactl command which you have to run with root permissions as it changes a protected file. If you want to stop the current state being saved when the machine shuts down then you need to disable the alsa-utils init script from running when the machine enters runlevel 0 halt and 6 reboot.
As well as using amixer on the command line to change the volumes and so on, you can also use a slightly graphical utility called alsamixer. Press the Esc key to exit. Front Left - Front Right Limits: Playback 0 - Mono: Capture 0 - Front Left: