same sound attached to multiple mesh

Hi,

I have another strange question for you.

Let's suppose we have 3, 4 characters with walk animation, and a walk sound. 

How to attack sound to all 4 characters without upload the same sound for all 4?

It's possible? Or will be possible,... like a clone method? 

I try to simulate something

 http://www.babylonjs-playground.com/#UWCDG#1

Thaks a lot.