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If you are a Star Wars fan consider this my, "Help me, Obi Wan" moment.
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Firefox or iTunes, etc.) they are all routed correctly through my Apollo Twin and out to my studio monitors. I can imagine that the reason the Dialog Launcher button is unresponsive has to do with this greying out of the Enable feature button. (I include a screen shot jpeg of the dialog window.) On the far right of this dialog box it offers Enable or Disable choices but they are both greyed out.In the box named Feature:, I chose Playback Devices.I chose Keyboard Shortcuts which brought up a box named Tab or category with a list from which I chose Play Tab.I went to Sibelius preferences (under the Sibelius menu).I think you are onto something with your last reply. So sorry to continue to be a problem but please know I deeply appreciate your help to what has become a very vexing issue. Once again, everything was fine yesterday. I'm sure there is a simple thing I am missing but in manual, on internet or 7.5 reference or tutorials, I cannot find it. But when I select that button I get nothing - crickets. What I did find is under the Play menu, in the Setup portion, there is a little almost invisible button (right below the Mixer icon) which, when I hover my pointer over it, tells me that it will reveal the Playback Devices dialog and allow me to create or edit playback configurations. I have rebooted my computer and closed and reopened Sibelius. I know the Apollo output is working because all other audio output from my computer (cat videos, etc.) are coming through my monitors. Today audio output is coming from the little tiny speaker on my Mac Pro. Yesterday audio output from a Sibelius score was going through my Apollo Twin and out to my near field monitors and all was right with the world.
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