content: tell application "System Preferences"
  	reveal anchor "Hearing" of pane id "com.apple.preference.universalaccess"
  end tell
  
  tell application "System Events"
  	tell application process "System Preferences"
  		-- set frontmost to true
  		tell window "Accessibility"
  			##--> pre 10.9 set monoStereoCheckbox to checkbox 2 of group 1
  			set monoStereoCheckbox to checkbox "Play stereo audio as mono" of group 1
  			tell monoStereoCheckbox to click
  		end tell
  	end tell
  end tell
  
  -- if application "System Preferences" is running then
  -- 	tell application "System Preferences" to quit
  -- end if