I want to make it so whenever I press the Mute speakers button in Volume Control or press the mute sound key on my keyboard both speakers and headphones get muted. This is what it was like when I had Windows 7 installed but currently (on Windows 8 Release Preview) only speakers are affected by Mute.
The speakers are plugged into the green jack (or whatever it's called) on the rear side and the headphones are plugged into pink/green ports on the PC's front panel.