Press the green flag. A pop up will show up, click accept. Then, make some noise! If you're too loud, it will alert you. Press the space bar on your keyboard to activate precise sound meter. Precise Sound Meter is made to measure you noises more detailed. Press the s key on your keyboard to make the Sound Meter more sensitive to noises. press the x key on your keyboard to reset the sound meters settings.
Thanks to vanobras for some script