unbalanced audio after every reboot

[theruck]

everytime i reboot my USB sound card is set to unbalanced state like this

does anybody know which nvram setting or any other trick can make it centered?

 

[theruck]

--  # Check to see if System Preferences is
--  # running and if yes, then close it.
--  #
--  # This is done so the script will not fail
--  # if it is running and a modal sheet is
--  # showing, hence the use of 'killall'
--  # as 'quit' fails when done so, if it is.
--  #
--  # This is also done to allow default behaviors
--  # to be predictable from a clean occurrence.

if running of application "System Preferences" then
    try
        tell application "System Preferences" to quit
    on error
        do shell script "killall 'System Preferences'"
    end try
    delay 0.1
end if

--  # Make sure System Preferences is not running before
--  # opening it again. Otherwise there can be an issue
--  # when trying to reopen it while it's actually closing.

repeat while running of application "System Preferences" is true
    delay 0.1
end repeat

--  # Open System Preferences to the Ouput tab of the Sound pane.

tell application "System Preferences" to ¬
    reveal anchor "output" of ¬
        pane id "com.apple.preference.sound"

--  # Wait for the target UI element to be available to minulate.       
--  # Then minulate the target UI element.

tell application "System Events"
    tell application process "System Preferences"
        set i to 0
        repeat until exists slider 1 of group 1 of tab group 1 of window 1
            delay 0.1
            set i to i + 1
            if i ≥ 30 then return
        end repeat
        set the value of slider 1 of group 1 of tab group 1 of window 1 to 0.5
    end tell
    delay 0.2
end tell

tell application "System Preferences" to quit

this applescript code i found on stackexchange which resets the audio balance so a workaround by running this after reboot or any other schedule works