<P>With a custom player class, you can create splashy footstep sounds in PrecipitationZones that have bSplashyFeet set.  Try it out on a variety of surfaces here.
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<P>PrecipitationZone has a static function for easy integration of the effect into a custom player class (or even custom ScriptedPawns).  Check out the player class included in this demo for an example of how to use it.