Toggle output device through System Preferences on macOS

toggle_audio_output.scpt

tell application "System Events"
	tell application "System Preferences"
		activate
		set current pane to pane "com.apple.preference.sound"
	end tell
	tell application process "System Preferences"
		repeat until (exists window "Sound" of application "System Preferences")
			delay 1
		end repeat
		tell tab group 1 of window "Sound"
			click radio button "Output"
			if (selected of row 2 of table 1 of scroll area 1) then
				set selected of row 1 of table 1 of scroll area 1 to true
				set deviceselected to "Internal Speakers"
			else
				set selected of row 2 of table 1 of scroll area 1 to true
				set deviceselected to "External Output"
			end if
		end tell
	end tell
	tell application "System Preferences" to quit
end tell