[1.7.10] How to correctly use PositionedSound?

i'm creating block, that must loop-play a sound while it's working. I looked into minecraft sources and found class that i need to do that(i hope it's correct) - PositionedSound. But i don't know how to use it and make it work. I created this:

package WildCakes.items.machine;

import WildCakes.Constants;
import net.minecraft.client.Minecraft;
import net.minecraft.client.audio.ITickableSound;
import net.minecraft.client.audio.PositionedSound;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.ResourceLocation;
import net.minecraft.world.World;

public class MatterFabWorkSound extends PositionedSound implements ITickableSound {

public MatterFabWorkSound(TileEntity parent) {
	super(new ResourceLocation("minecraft", "mob.zombie.death"));
	this.repeat = true;
	this.volume = 1F;
	this.field_147663_c = 1F;
	xPosF = parent.xCoord;
	yPosF = parent.yCoord;
	zPosF = parent.zCoord;
}

@Override
public boolean isDonePlaying() {
	return false;
}

@Override
public boolean canRepeat() {
	return super.canRepeat();
}

@Override
public void update() {

}
}

and put it into block's createNewTileEntity()

@Override
public TileEntity createNewTileEntity(World world, int metadata) {
	MatterFabTile matterFabTile = new MatterFabTile();
	MatterFabWorkSound workSound = new MatterFabWorkSound(matterFabTile);
	Minecraft.getMinecraft().getSoundHandler().playSound(workSound);
	return matterFabTile;
}

i'm quite sure i did something wrongly, but i don't know what exactly is wrong. Please, can someone help me with that?

p.s i use zombie dying sound for testing