everytime I try to imput a environmental sound, it says, not a valid Class name???? Can someone please help me?

Thank you, it's very helpful !

where's the description?

Subscribe to this park and open it in the editor. Go to File->Extract Package and save in a convenient location. Copy any or all of the script folders to your own park folder. Some scripts are objects that can be added to the scene using the Scenery->Choose.. function. Others, such as onboard audio, need to be added to individual coasters in the Scripts tab of the Coaster Properties dialog.

lol Wilhelm Scream

Wilhelm Screan + SNCF Jingle