I’ve never tried this before, but was rather surprised that it didn’t work when I just did so perhaps someone can chime in although I have a feeling I should know this one LOL
This WORKS
tell application "QuickTime Player"
set sound volume of document 1 to 0
end tell
NEITHER of these work though
set QT to application "QuickTime Player"
tell QT
set sound volume of document 1 to 0
end tell
set QT to "QuickTime Player"
tell application QT
set sound volume of document 1 to 0
end tell