Unrealscript to create custom footsteps. Goes with this blog entry: http://oculusdrifter.blogspot.com/2013/10/custom-footstep-sounds-in-udk.html

CustomGame.uc

class CustomGame extends UTGame;

static event class<GameInfo> SetGameType(string MapName, string Options, string Portal) {
	`log("CustomGame.SetGameType: ==================================================");
	return Default.class;
}

event InitGame( string Options, out string ErrorMessage ) {
	`log("CustomGame.InitGame: ------------------------------------------------------");
	super.InitGame(Options,ErrorMessage);
}

defaultproperties 
{
	PlayerControllerClass=class'CustomGamePlayerController'
	DefaultPawnClass=class'CustomPawn'
}

CustomGamePlayerController.uc

Class CustomGamePlayerController extends UTPlayerController;

defaultproperties {

}

CustomGameSoundGroup.uc

class CustomGameSoundGroup extends UTPawnSoundGroup;

defaultproperties 
{
	DodgeSound=SoundCue'A_Character_CorruptEnigma_Cue.Mean_Efforts.A_Effort_EnigmaMean_Dodge_Cue'
	DoubleJumpSound=SoundCue'A_Character_CorruptEnigma_Cue.Mean_Efforts.A_Effort_EnigmaMean_DoubleJump_Cue'
	LandSound=SoundCue'A_Character_CorruptEnigma_Cue.Mean_Efforts.A_Effort_EnigmaMean_LandLight_Cue'
	DyingSound=SoundCue'A_Character_CorruptEnigma_Cue.Mean_Efforts.A_Effort_EnigmaMean_Death_Cue'
	HitSounds[0]=SoundCue'A_Character_CorruptEnigma_Cue.Mean_Efforts.A_Effort_EnigmaMean_PainSmall_Cue'
	HitSounds[1]=SoundCue'A_Character_CorruptEnigma_Cue.Mean_Efforts.A_Effort_EnigmaMean_PainMedium_Cue'
	HitSounds[2]=SoundCue'A_Character_CorruptEnigma_Cue.Mean_Efforts.A_Effort_EnigmaMean_PainLarge_Cue'
	FallingDamageLandSound=SoundCue'A_Character_CorruptEnigma_Cue.Mean_Efforts.A_Effort_EnigmaMean_LandHeavy_Cue'
	GibSound=SoundCue'A_Character_CorruptEnigma_Cue.Mean_Efforts.A_Effort_EnigmaMean_DeathInstant_Cue'

	CrushedSound=SoundCue'A_Character_BodyImpacts.BodyImpacts.A_Character_RobotImpact_BodyExplosion_Cue'
	BodyExplosionSound=SoundCue'A_Character_BodyImpacts.BodyImpacts.A_Character_RobotImpact_BodyExplosion_Cue'
	InstaGibSound=SoundCue'A_Character_CorruptEnigma_Cue.Mean_Efforts.A_Effort_EnigmaMean_DeathInstant_Cue'
	
	DefaultFootStepSound=SoundCue'A_Character_Footsteps.Footsteps.A_Character_Footstep_DefaultCue'
	FootstepSounds[0]=(MaterialType=Stone,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_StoneCue')
	FootstepSounds[1]=(MaterialType=Dirt,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_DirtCue')
	FootstepSounds[2]=(MaterialType=Energy,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_EnergyCue')
	FootstepSounds[3]=(MaterialType=Flesh_Human,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_FleshCue')
	FootstepSounds[4]=(MaterialType=Foliage,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_FoliageCue')
	FootstepSounds[5]=(MaterialType=Glass,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_GlassPlateCue')
	FootstepSounds[6]=(MaterialType=Water,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_WaterDeepCue')
	FootstepSounds[7]=(MaterialType=ShallowWater,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_WaterShallowCue')
	FootstepSounds[8]=(MaterialType=Metal,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_MetalCue')
	FootstepSounds[9]=(MaterialType=Snow,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_SnowCue')
	FootstepSounds[10]=(MaterialType=Wood,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_WoodCue')
	FootstepSounds[11]=(MaterialType=Quack,Sound=SoundCue'myproject.Sounds.quack_cue')

	JumpingSounds[0]=(MaterialType=Stone,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_StoneJumpCue')
	JumpingSounds[1]=(MaterialType=Dirt,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_DirtJumpCue')
	JumpingSounds[2]=(MaterialType=Energy,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_EnergyJumpCue')
	JumpingSounds[3]=(MaterialType=Flesh_Human,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_FleshJumpCue')
	JumpingSounds[4]=(MaterialType=Foliage,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_FoliageJumpCue')
	JumpingSounds[5]=(MaterialType=Glass,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_GlassPlateJumpCue')
	JumpingSounds[6]=(MaterialType=GlassBroken,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_GlassBrokenJumpCue')
	JumpingSounds[7]=(MaterialType=Grass,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_GrassJumpCue')
	JumpingSounds[8]=(MaterialType=Metal,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_MetalJumpCue')
	JumpingSounds[9]=(MaterialType=Mud,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_MudJumpCue')
	JumpingSounds[10]=(MaterialType=Metal,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_MetalJumpCue')
	JumpingSounds[11]=(MaterialType=Snow,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_SnowJumpCue')
	JumpingSounds[12]=(MaterialType=Tile,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_TileJumpCue')
	JumpingSounds[13]=(MaterialType=Water,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_WaterDeepJumpCue')
	JumpingSounds[14]=(MaterialType=ShallowWater,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_WaterShallowJumpCue')
	JumpingSounds[15]=(MaterialType=Wood,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_WoodJumpCue')
	JumpingSounds[16]=(MaterialType=MetalFrame,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_MetalJumpCue')

	DefaultLandingSound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_DirtLandCue'
	LandingSounds[0]=(MaterialType=Stone,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_StoneLandCue')
	LandingSounds[1]=(MaterialType=Dirt,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_DirtLandCue')
	LandingSounds[2]=(MaterialType=Energy,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_EnergyLandCue')
	LandingSounds[3]=(MaterialType=Flesh_Human,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_FleshLandCue')
	LandingSounds[4]=(MaterialType=Foliage,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_FoliageLandCue')
	LandingSounds[5]=(MaterialType=Glass,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_GlassPlateLandCue')
	LandingSounds[6]=(MaterialType=GlassBroken,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_GlassBrokenLandCue')
	LandingSounds[7]=(MaterialType=Grass,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_GrassLandCue')
	LandingSounds[8]=(MaterialType=Metal,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_MetalLandCue')
	LandingSounds[9]=(MaterialType=Mud,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_MudLandCue')
	LandingSounds[10]=(MaterialType=Metal,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_MetalLandCue')
	LandingSounds[11]=(MaterialType=Snow,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_SnowLandCue')
	LandingSounds[12]=(MaterialType=Tile,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_TileLandCue')
	LandingSounds[13]=(MaterialType=Water,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_WaterDeepLandCue')
	LandingSounds[14]=(MaterialType=ShallowWater,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_WaterShallowLandCue')
	LandingSounds[15]=(MaterialType=Wood,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_WoodLandCue')
	LandingSounds[16]=(MaterialType=MetalFrame,Sound=SoundCue'A_Character_Footsteps.FootSteps.A_Character_Footstep_WoodLandCue')
}

CustomPawn.uc

class CustomPawn extends UTPawn 
	placeable;

simulated function SetCharacterClassFromInfo(class<UTFamilyInfo> Info) {
	`log("CustomPawn:SetCharacterClassFromInfo -------------------------------------------");
	Super.SetCharacterClassFromInfo(Info);
	SoundGroupClass = class'CustomGameSoundGroup';
	`log("CustomPawn:SetCharacterClassFromInfo SoundGroupClass = " @ SoundGroupClass);
}