Cómo utilizar Applescript para ajustar el volumen del sonido de salida

Quiero modificar el Applescript que utilizo para seleccionar la salida de sonido, para que también marque el volumen de salida al 100%.

(*
Applescript to toggle between two sound outputs by Line number, ¬
as they appear in the Sound Control Panel. Based on code by ¬
Arthur Hammer http://apple.stackexchange.com/a/209434/85275
*)

set internal to 1 --internal speakers
set batcave to 3 --Bat Cave

tell application "System Preferences"
    activate
    set current pane to pane "com.apple.preference.sound"
end tell

tell application "System Events"
    tell application process "System Preferences"
        repeat until exists tab group 1 of window "Sound"
        end repeat

        -- I added this line to dial the volume up to 100%
        set volume output volume 1.0

        tell tab group 1 of window "Sound"
            click radio button "Output"
            if (selected of row internal of table 1 of scroll area 1) then
                set selected of row batcave of table 1 of scroll area 1 to true
            else
                set selected of row internal of table 1 of scroll area 1 to true
            end if
        end tell
    end tell
end tell
--tell application "System Preferences" to quit
--remove the comment '--' tag above to make the control panel quit afterwards, leave for testing.

El error es:

tell current application
    set volume «class pcap» "System Preferences" output volume 1.0
Result:
error "System Events got an error: Can’t make application process \"System Preferences\" into type small real." number -1700 from application process "System Preferences" to small real

Supongo que me faltan algunos comandos contextualizadores como "tell..." delante del comando "set column". ¿Sugerencias?

Estoy ejecutando MacOS 10.15.7 (Catalina)