Learn how to make a mute plug for your computer by following the steps outlined in this tutorial. This plug can be used for anything, including computers, stereos, mp3 players, or anything else with speakers that has audio. A mute plug is useful to get back at someone that constantly plays their stereo too loud because you are essentially cutting off their audio with this plug. The plug is place into where the headphone equipment would normally go. What you need are some old headphones. Take some wire cutters and cut off the plug of the headphones. Then, insert it into the headphone jack and the sound will be muted.