Echo

Is it possible to make your maps to have echo ? I think i heard it in freespace : \

Env_soundscape, make a custom one with reverb or use on of these; http://developer.valvesoftware.com/wiki/List_of_HL2_Soundscapes

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Please note that some of these have sounds in them, try to choose a quiet one. There might be a coast one that is quiet with echo.