-- Mute

set myMic to "Scarlett Mic"
set displayNotification to myMic & " Muted"

tell application "System Events"
    try
        tell process "Loopback"
            set theDeviceSwitch to UI element "Device Switch" of UI element myMic of UI element "Devices" of window 1
            set theMicState to get value of attribute "AXValueDescription" of theDeviceSwitch
            if theMicState is "On" then click theDeviceSwitch
            display notification displayNotification
        end tell
    on error errMsg
        return "Error: " & myMic & " still Unmuted!"
    end try
end tell

-- Unmute

set myMic to "Scarlett Mic"
set displayNotification to myMic & " Unmuted"

tell application "System Events"
    try
        tell process "Loopback"
            set theDeviceSwitch to UI element "Device Switch" of UI element myMic of UI element "Devices" of window 1
            set theMicState to get value of attribute "AXValueDescription" of theDeviceSwitch
            if theMicState is "Off" then click theDeviceSwitch
            display notification displayNotification
        end tell
    on error errMsg
        return "Error: " & myMic & " still Muted!"
    end try
end tell