Add a background sound and a mute button

[Hippani]

Add an mp3 or wav to the library (MySound in this example).

Turn off autoplay for the movie.

In 'OnStart' add code like this:

PlaySound("MySound",true);
Play();

Add a toggle button. Change 'OnClick':

StopSound("MySound");

Change 'OnRelease' to:

PlaySound("MySound",true);

[thunder]

what if there are 3 music pieces througout the movie how would I turn of music (same button)?

[FlashKnight]

StopSound("MySound1");
StopSound("MySound2");
StopSound("MySound3");

or you can use a loop condition to stop these music.

[thunder]

a simple stop command for all three, of course .
a loop condition? ok i'll have to figure out how that works. I was thinking about OnUpdate script that might check if a music off button was pressed at first. but a loop condition is probably a better solution