Mute/unmute via applescript?

[wc8]

I can use the following to toggle mute sound, but as far as I can tell, it won't check if the sound is already muted or not muted.

tell application "Pomodoro" to start pomodoroName duration workLength break breakLength
tell application "System Events"
tell application "Pomodoro" to activate
key code 29 using {command down, control down, option down}
end tell

Is there a way to tell the app to "mute" or "unmute" specifically?
For example,
• applescript "studying" starts a pomodoro and tells it to mute sound (no ticking noise)
• applescript "housework" starts a pomodoro and tells it to unmute sound (ticking noise)
• applescript at the end of a session unmutes sound (default ticking noise)