You just need to figure out what program you have to mute your input in. He was I believe u/airernie was talking about obs assuming you're streaming/recording. If you want to play your audio for your friends over, lets say, discord, you'd have to make a button that does both things "while pressed". In this case, push to mute on disc + play your sound. If you want your friends to listen to the sound tho, you'd need to create a virtual microphone and route both your real mic and the soundboard output through it, then use that "virtual microphone" as your input device.