posted 05-24-2002 02:13 AM
if you DON'T need the object but only the sound, and you are "lazy" (LOL) to edit the sound.txt or to find all the sounds you need in your wad again in order to edit the sound.txt, you can avoid that in this way: create a new wad from yours adding simply the waterfall, name it as you want and save.Then, use only the sam and sxf files trwest created: name them as your old wad you are using. The sound is listed there in the correct way, but you hadn't added an useless object in your wad. 
If the waterfall is already there in your wad, but it simply does NOT play, it could be that you have too many sounds listed and too heavy...
I had a problem like that with the warerfall sound: it had to play just when the flipmap was activated, but after loading the savegame gave me NO sounds on the flipped room. But I can't remember now how I resolved, sorry, that was too many months ago 
(maybe I simply replaced a looped sound with the waterfall_loop I needed re-naming it...)