Hello, I am beginner: I have get to play a background sound in my vtour, but I cannot get to show and use a button on/off fo sound like it is in the examples of krpano. The code I am trying is: Source code 1 2 3 4 5 <!-- a button to pause/play the sound --> <layer name="snd" url="soundonoff.png" align="leftbottom" x="10" y="10" alpha="0.25" scale="0.5" onover="tween(alpha,1);" onout="tween(alpha,0.25);" crop="0|0|50|50" onclick="pausesoundtoggle(bgsnd); switch(crop, 0|0|50|50, 0|50|50|50);" /> a...