2) In your <$checkbox> widget, add a "checkactions" parameter, like this:
<$checkbox ... checkactions="""<$action-sendmessage $message="tm-notify" $param="DoneSound" />""">
checkbox text goes here
</$checkbox>
1) The audio element uses "autoplay" and "controls", with a style attribute to make the display of the controls more compact than the default appearance.
2) The $checkbox widget uses checkactions="..." to send a "tm-notify" message to display the DoneSound contents in the upper right corner of the page.
3) Note that the notification message has a display duration of 3 seconds, so it will only play up to 3 seconds of sound before automatically going away.
enjoy,
-e