The CS-3 is an analog compressor that evens out the dynamics of the input signal, resulting in smooth sustain. It employs a high-performance VCA circuit, ensuring fast compression response and stable sustain. The wide-range SUSTAIN control and the TONE control, which adjusts the high-frequency components, allow for a wide range of sound characteristics, from fat, flowing lead sounds to crisp, articulate cutting. Furthermore, by controlling the attack with the ATTACK knob, it's possible to create a clear and crisp sound with distinct attack for each note, even in passages with many notes. The exterior shows signs of use, but there are no problems with its operation. *Box soiled* Taiwanese-made early ACA specificationsCondition: No problems with use. Points to note: Box is dirty, made in Taiwan, original ACA specifications. Accessories: Box, instruction manual. Warranty: No warranty. Sold as is.