Controlling dual display sound from keyboard

Joined
May 9, 2011
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Your Mac's Specs
2013 iMac 27" Intel i5 Processor, 16Gb RAM, 10TB HD (9TB External) , 2 x iPhone 5, 2 x iPad Retina
I have an iMac & thunderbolt display and I have changed the settings so that sound comes from both. However, I cannot control the volume from the keyboard or the Mac itself (volume in menu bar) as it is greyed out?

Is there any way around this? Seems strange to be able to use dual display sound but not control the volume?
 

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