art scl2 compressor art scl2 compressor. the scl2 is a quiet and versatile processor. it is a two-channel compresser, limiter/expander and a gate all in one. it is an ideal live system processor that does a great job at the essentials of live sound presentation, preventing spikes of volume and potential distortion, and tames mics with the gate in such a way that your drums and vocals sound tighter and cleaner. it is a highly sophisticated and flexible dynamics processor designed for easy operation and great tone. the unit can be adjusted to provide anything from smooth, subtle compression to hard limiting. noise reduction is provided by a fast solid gate or a subtle expander. the attack and release functions allow the user to set the general operating range and then automatically adapt to the audio being processed. a full auto mode is also available. the ultra-precise led meters while two led meters clearly display the gain reduction for each channel.