Audio Problem connecting external apple speaker to iMac

When I connect my Apple HIFI External Speaker to the audio out at the back of my iMac with the apple RCA optical cable, I can no longer control volume with the apple keyboard.
I can only control the volume with the apple remote.
1. Any suggestions to maintain keyboard control as well
Thanks

When you connect the third-party monitor, you can use System Preferences -> Displays to control the external monitor. You may have your preferences set to Mirror the iMac's display. But if the resolution (pixels supported by the external screen) does not match the iMac display, then it will not display properly. You need to uncheck the Mirror option in that instance. When the display is not a 'mirror', you need to drag some content (windows) to the external display to see what you want to work on there.
Once the system detects your external monitor, you can make that change. You also need to line up the two monitors in the way you wish to move content between them and which monitor you want to display the Apple menu bar. For example, the iMac display may have its right side aligned with the left side of the external display so you can drag windows through the right side of the iMac screen and they'll appear on the left side of the external display.
You also drag the Apple menu bar to the external display if you'll be working with programs using the external display. You can set resolution and other things on the two displays independently.
Hope this helps.

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