Adrian, there's several ways to do footstep sounds I'm sure you can find something like that in the AUM's or if you search the forums. One way to do it is just a matter of playing a sound when the animation value goes past a certain amount and setting a variable to stop the sound playing again unti the animation resets or something. Also details of that contest can be found in The Amazing AUM 56 of The Great George.

Screens of Axys:

http://www.churness.com/axys/Screenshots/AxysShotZ%20(3).jpg
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http://www.churness.com/axys/Screenshots/AxysShotZ%20(120).jpg
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http://www.churness.com/axys/Screenshots/AxysShotZ%20(149).jpg
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http://www.churness.com/axys/Screenshots/AxysShotZ%20(1).jpg