AppleScript syntax do shell scripts

Hi guys,

i am having endless issues with the syntax of the following applescript. Please help me and i'll make you my new god, cheers. The

applescript syntax is:

tell application "Finder"

  display dialog ¬

                    "Select Output Source" buttons {"Computer", "TV"} default button "TV"

          set InternalSpeakers to (do shell script "cd ~/Downloads/SwitchAudioSource-v1; ./SwitchAudioSource -s 'Built-in Output'")

  --InternalSpeakers is now a variable which changes the sound output to Computer

          set HDMI to (do shell script "cd ~/Downloads/SwitchAudioSource-v1; ./SwitchAudioSource -s 'Soundflower (16ch)'")

  --InternalSpeakers is now a variable which changes the sound output to TV

          if button returned of result = "Computer" then InternalSpeakers

          if button returned of result = "Computer" then HDMI

end tell

at the moment i am getting the following error:

I have tried arranging and re-arranging the applescript to no avail, please help me

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