Without deteriorating the original sound, the BOSS Compressor / Sustainer does his work unobtrusively but effectively (exactly what you would want from a good compressor). Peak levels are limited while the quiet passages are raised, serving the assertiveness (especially clean tones), and generating a more balanced sound. At extreme settings, a significant extension of the sustain is possible - suitable if you want to play a solo with cleaner amplifier setting. The CS-3 is versatile adjustable, noteworthy is the tone control that can compensate for a loss of height with heavy compression.