You could always go for SitRep Pro...but be warned...although you hear your own footsteps (and allies I believe) at 1/2 volume, doesn't mean that your enemies here them at 1/2 volume...your enemies hear them at full volume.
SitRep Pro is a very overlooked perk because it takes forever to unlock. It's handy for camping (hear enemy footsteps 2x louder (ninja pro footsteps sound like normal in my opinion)).