1/2 mute

Hello,

You can use third party software, Some third-party applications, often called "macro" or "hotkey" software, can be configured to execute a sequence of actions with a single button press. You could potentially set up a macro that: 

Press 1: Lowers the volume to 50% (half-mute).

Press 2: Lowers the volume to 0% (full mute).

Press 3: Raises the volume back to 100% (unmute).

However, this would require a program that can interact with daily pay your system's master volume control and is highly dependent on the specific software's capabilities.