Perfect Hotkey has been developed to let you quickly increase, decrease, or mute volume with hotkeys. It's very useful when you play video on your PC in full screen mode. You can easily adjust the volume without leaving full-screen mode.
You can follow the below steps to set up a hotkey for changing volume:
1. Run Perfect Hotkey, click on the system tray icon then select New Hotkey menu command.
2. Click on the + button on Add New Hotkey dialog.
3. Select 'Volume UP' or 'Volume Down' from the action list.
4. Click OK to complete the process. Now You can easily adjust the volume without leaving full-screen mode when you play video.