Making the announcer speak

Hello, all. I am wondering on what I should do to make the announcer speak? Do I use a soundscape entity? I’ve never dabbled with sound before and I’ve searched online but to no avail.

What announcer are you talking about?

For Dota2?
http://facepunch.com/forums/411

Apologies, I’m talking about TF2. I never touch Dota2.