How to make footstep sound trigger?

Okay, first of all, you must have hyper triggers.
Then, you could do this trigger:

Condition:
'Player X' bring 0 'a unit' at 'Footsteps'
Action:
Center location labeled 'Footsteps' on 'the same unit' at 'Anywhere'
Play "Footsteps"
Preserve Trigger

For best results, make the location as small as you can, in 3rd party editor, such as SCM Draft, you can get it down to a single pixel, and that works the best.

If you have multiple boxes of different sizes you can set up triggers to play sounds for walking slowly, walking, and sprinting [Stimpax]

Thank you guys! Now I can make it..
Thank you!

Cool idea!