The Input/Output meters indicate input and output signal levels in dB. When Impact is used in mono or stereo, both input and output meters are displayed. When Impact is used in a multichannel format, only output meters are displayed by default. You can toggle the meter display to show only input meters by clicking the blue-green rectangle at the lower right of the meter display.A red clip indicator appears at the top of each meter. Clicking a clip indicator clears it. Alt-clicking (Windows) or Option-clicking (Mac) clears the clip indicators on all channels.