I tried to have ambient sound, read a couple of posts and couldn't do it.
My question is this:
What is the easiest way to have ambient sound forced (not the ones in missions) because lotso players remove their amb and amb_stereo folders.
Is it possible for a sound to be heard only in 1 room?
Do you mean a custom ambient sound? I suggest you read the Ambient Sounds tutorial by Innkeeper and me
For a sound in one room you can't use the ambient sound system since all clients would hear the same noise. You'll have to use a script_model 'speaker' instead. See my Custom Sounds tutorial