[SOLVED]Use of HL2 soundscapes for TF2

For my map I'm working on, I want to use one of the soundscapes from "soundscapes_streetwar.txt".
I put this in my custom>example>scripts folder and then entered "streetwar.util_muffled_light_combat" into the env_soundscape in hammer. However, it doesn't play when in-game.

Help please. Thanks.

Ok, thanks!