Why do I see an older Articulate Storyline file provide "mute" via the Player Volume button?

Oct 22, 2020

I am  revising some older articulate storyline file that was created by someone else, and I see the volume button on the player allows me to mute the audio with one single click. This is different from what I have searched on this forum. From what I read, it seems that only javascript can do that. 



Can someone explain why this story file can use the player volume button to mute? I checked and it is using the "Classic" player. So it seems to me the previous developer didn't customize anything. 

Attached a simplified file here. 


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