Questions for Skin | Wraith VoidWalker recolor 22 December

Hi I bought the Wraith skin from Voidwalker. I have a question about the details.

I have met other Wraith's with the same Voidwalker skin theme. But they sound like the voice of the Wraith inside the suit. This is a detail I know.

In case you didn't understand, it's because when you have the space helmet, you would be heard in a more realistic tone that is inside a suit.

My problem is: I have the skin of 22 December Voidwalker, but my voice detail does not appear. When I choose it, the animation of your Voidwalker theme appears, but I don't have that detail in the skin of your voice.

I wanted to know if I have to activate something in the skin or if it has to be in the Original that this detail happens. Thank you all.