setting audio balance from command line

Question

I'd like to set audio balance from command line (linux), I'v looked at 'aumix' (and googled around) but it seems it does not have an option... can you suggest any method?

Answer 1

With amixer, you can set the volumes of the left and right ALSA channels. For example,

amixer sset Master 80%,20%

will shift the balance toward the left.

Answer 2

I searched everywhere for this answer and here what I got

1. Download Alsamixer.
2. Go to settings and select "alsa_amixer controls" or the second option under the mode
3. From all commands search for "Headphone Volume" and change the values to 63,0 or 0,63.

Answer 3

If you are using MacOS you create an AppleScript:

# Start preferences with the right page
tell application "System Preferences"
    activate
    reveal anchor "output" of pane id "com.apple.preference.sound"
    delay 0.5 -- If you get an error, it's possible this delay isn't long enough.
end tell
# Set volume balance to normal
tell application "System Events"
    tell slider 1 of group 1 of tab group 1 of window 1 of process "System Preferences"
        set value to 0.2
    end tell
end tell
# Quit system preferences
tell application "System Preferences"
     quit
end tell