This is a small AddOn that plays a sound and displays a message when Aimed Shot has a critical hit.

***This AddOn is based off of Interceptor's OverpowerAlert (found here: http://wow.curse.com/downloads/wow-addons/details/overpower-alert-fixed-for-bc.aspx)***

Commands:
/asa option /asa options - Opens options window.
/asa - Display commands
/asa on - Turn ASA on
/asa off - Turn ASA off
/asa toggle - Toggles ASA (On/Off)
/asa status - Shows current status (On/Off)
/asa soff /asa sound off - Turns the sound alert off
/asa son /asa soundon - Turns the sound alert on
/asa moff /asa message off - Turns the message alert off
/asa mon /asa message on - Turns he message alert on

NOTE: The core of this function has not been tested. Please try it out and comment here if it does work. Thanks =)