AppleScript to set macOS audio input device to "Internal Microphone"

FixBTSound.applescript

-- Sets your audio input source to "Internal Microphone"
-- Frequently needed if you use bluetooth headpohones and
-- run the Xcode iOS simulator, which will often set your
-- headphones to be the input device, resulting in a drastic
-- decrease in sound quality, and making it mono 

tell application "System Preferences" to activate
tell application "System Preferences"
    reveal anchor "input" of pane id "com.apple.preference.sound"
end tell
delay 0.5
tell application "System Events" to tell process "System Preferences"
    tell table 1 of scroll area 1 of tab group 1 of window 1
        select (row 1 where value of text field 2 is "Built-in")
    end tell
end tell
quit application "System Preferences"

install homebrew, set it to path, install switch audio source

terminal setup:

1. /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
2. after its done, check the "next steps" in terminal for your code, you can drop all 3 lines in at once, this will add homebrew to path
3. brew install switchaudio-osx

applescript:

do shell script "/opt/homebrew/bin/SwitchAudioSource -t input -s 'MacBook Air Microphone'"

The above is for a MacBook air, list your audio devices in terminal with the below code to get your input name:

SwitchAudioSource -t input -a