Douk Audio MC1034 Portable 3-Way 3.5mm AUX Audio Switcher, Audio Selector for Headphones, Speakers, and Microphones

Not sure how you guys are still having mute problems, just buy one of these: https://www.amazon.com/dp/B08MW5JRWS ITS IMPOSSIBLE to mute because ANALOG signal can only travel to one PC at a time.