Reply to Question 1
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You have to do something like this:
int &mysound = playsound(Blah Blah);
sound_set_kill(&mysound);
Note: that's if the kill sound command will be given in the same script. If not, replace &mysound with a global variable.
int &mysound = playsound(Blah Blah);
sound_set_kill(&mysound);
Note: that's if the kill sound command will be given in the same script. If not, replace &mysound with a global variable.