FSX Linking sound to Cargo door

Hi everyone. I've been working on my PA A320's sounds and I have created a sound similar to that of the Hyd pump being activated which I want to link to the keyboard command of opening the Cargo Door. But I have no clue how to link a sound to a Keyboard command. All I want is for the .WAV file to be played one time in the cockpit whenever I press the SHIFT+E+2 command to open the cargo door.
Could anybody help me or indicate to me where I could find a tutorial about this? Is this process even possible? Or is it highly complex?
 
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