audio on photoshop not working

This is a very annoying bit of interface design. I had the same problem as ikari; no sound played on my video layer. I hadn't used video in a long time, and have no idea why it would change settings in the interim.   Davescm had the answer for me, because he circled the speaker button. I knew that I had repeatedly clicked that icon from mute to unmute and back again, with no effect.         It turns out there are two of the teeny little things! I've labeled them 1 and 2 on my screenshot. I had been toggling the lower one (2) beside the music notes to the left of the audio track. I never noticed that there's another one (1) up by the play controls! But that's what Dave had circled.

Here's where I think it could use improvement: BOTH have to be on (little sound waves coming out) for the sound on the video to play, and they don't affect each other. I think it makes more sense to have both go mute when you mute one of them, etc. Unless that messes up something I don't know about. In fact, why 2 of them?

I also tested Michael Riordan's answer. Guess what? If you mute only button 1, up by the play controls, have button 2 set to make sounds, and hold option/Alt, the sound plays with the video. But the reverse is mute: 1 off, 2 on, plus hold option/Alt, play and there is no sound. I don't know how he found that out, but it works--at least in one direction.  

So thanks to both of you! I could have wasted several days otherwise. Surely this is a mistake, maybe a control leftover when something else was changed?  PixelAnnie   [website removed]