Your switch isnt connected with the execution pin.
If that isnt the solver and you just disconnected it out of whatever reason, debug if the footstep notify triggers correctly and check the location of the sound.
Also check the sound class and setup you are using if you are handling it with a mixer etc.
Oh and do you really need that trace? Just go for a bone location of your pawn. Minimizes overhead and error potential like wrong channel trace etc. If you need it, I would recommend a trace against object due to your usage against world static.
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thank you so much it worked why did i not see that 
It happens to even the best that sometimes its just missing something plainly simple.
Glad I could help you, good luck for your further work.