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I'm not very good at scripting or code or even the simple codes that you get...

I have a sound playing and when it goes out of view I want it to stop. I know I need to use the stop sound feature but I doesn't work, Generally giving the error "undeclared identifier (name of sound)".. How can I fix this?

i would suggest making 2 actors, make one actor just floating in the air, and if you hit it, it plays the sound. then make another actor and make a collision and all that lovely stuff and use script editor and use a event diasable action.

If you have any problems keep on asking!

its ok.. lol its the script to stop the sound is what i need...

Create an integer variable: chan(or any name you want)
now, in your playsound code,

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chan=PlaySound2("data/sound", 1, 1, 0);

or whatever the playsound function uses. Using chan=PlaySound2 assigns the channel variable to that sound, or something like that. Now to stop the sound:

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stopSound(chan);

Just a note on the subject of sounds- tha pan value: this is the value for which speakers to play the sound from-left or right- and how much to play from each speaker. Now, normally this is set manually, but I have developed a function to return a variable based on the actor's xscreen coordinates. So then, in the playsound:

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PlaySound2("data/sound", 1, 1, Bal()));

I can post it later if anyone is interested.