The cs-2 cmopresses high-input signals while boosting low-input signals, giving you smooth and long sustain without degrading the quality of the original sound. The cs-2 uses a vca (voltage controlled amplifier) instead of the photocouplers used by the cs-1.The vca's speeds up the signal processing and makes the attack much faster compared to the cs-1.
. The attack knob can however be used to control this.