I would like to add some ambient sound for my portals, how would I go about doing that in radiant and the sound aliases?

EDIT:
Also, I'm having problems using my teleporters I just scripted.

The way these teleporters work is they set the player's origin, however if that origin is outside the start zone even if it is in a different zone(not connected to start zone) I get killed and Samantha laughs when I teleport.

Could this be because when it sets the origin it moves the player to that position which moves the player to go out of the zone briefly causing this?

If so, how could it be fixed so I can teleport to a different zone?