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1. On the Task Bar, Click the Speaker icon on the right hand side.
2. In the popup menu, click the name of your current default sound device in the menu.
3. Select From the list, select the room's system as your output.  How this will be labeled depends on the equipment in the room, for example "Extron HDMI" or "Crestron HD audio".
4. The volume slider will effect how loud your Laptops sound is, along with the room's volume controls.

macOS

1. Open the Apple Menu (click on  in the upper-left corner) and select System Preferences.
2. Click on the Sound icon.
3. Click on the Output tab.
4. Select the room's system as your output.  It will be located below the built-in speakers for your laptop.  How this will be labeled depends on the equipment in the room, for example "Extron HDMI" or "Crestron HD audio".
5. System volume will now be controlled solely by the rooms room's volume controls.