The envelope output allows you to easily read amplitude of sound by simply measuring the analog voltage. Gain can be adjusted with a through-hole resistor, to change the threshold of the binary (gate) output pin as well. Check the hookup guide below for more information about setting gain.
Each of the three output signals is present on the 0.1″ header at the edge of the board and they are active simultaneously. If you aren’t using one in your particular application, simply leave that pin disconnected.