Snpc Footstep noises

I’m working on some SNPCs using Garry smod standard code for coding SNPCs (found on the gmod wiki, here: http://maurits.tv/data/garrysmod/wiki/wiki.garrysmod.com/indexde03.html?title=Basic_Scripted_NPC ) however it does not list any way of adding Footstep noises. I’m quite sure I have to make a function that calls the noises whenever the NPC moves, however I have no idea how I would go about doing that, still sort of new to Lua so if anyone could help, it would be appreciated.

(Also if this has already been asnwered, I apoligize for posting this, however I am for some strange reason unable to access the search functions on Facepunch. I am uncertain if this is just me, or if it is a problem everyone is having, but all I know is that when ever I try to search I am directed to a page informing me that “I do not have permission to access this page”.)

Perhaps this can be of assistance to you.

Edit:
Not really sure if that is how you do it. Just hope it points you in a direction.