Toggle sound... but also toggle image?

Hi all - I posted this in an old thread so I think it's missed.

Basically... 

I've tweaked an existing storyline 2 example... to toggle sound on/off... which it does... yay! HOWEVER... anyone know how I can switch the state of the button when the audio is on? And back to normal when it's off (for visual feedback...) I've tried 3 different ways but it will not change the state of the image/button when the True/false variable changes. Any ideas how to do this anyone?
I've attached my file if you want to see what I've done so far... hopefully it's not a complete mess :)

Thanks everyone...

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