My projector runs fine on my PC (where I have D11.5) but when pack up all the files and try to play it from a new machine, the projector plays the opening screen and as soon as it has to make the first sound, it freezes. It seems as if it can not find the sound. I tried putting the sound file right next to the projector and even that does not work.
My usual method is to call the sound files with the path such as
sound playfile 1, the moviepath & "sounds\" & "playThisSound.aif"
This works just fine on my machine. The projector does not hang up.
You are using ancient and deprecated Lingo to play sounds. Try importing them into a castLib and use sound(channel).play() or a new mixer object (consult the docs)