Add Impulse Listener to Virtual Camera [SOLVED]

Right, so, in essence. I've made a lot of cameras. And now I want to add impulse listeners to the lot, real basic stuff in a way.

But I am running into some problems with my code.

Code (CSharp):

1. gameObject.GetComponent<CinemachineVirtualCamera>().AddExtension(CinemachineImpulseListener);

You can see the intent in this simple line of code is just to add a cinemachine impulse listener, but it just states that it's not valid in the current context. So, I'd be really appreciative if I could get some help. Because impulse is perfect for my needs. I just need some help to retrofit it

 

Oh, I am a dumbo. It is a separate component (I thought it was an extension within a component)