This Symetrix 564E Quad Expander/Gate is designed to enhance the sound quality of your audio recordings. With its noise gating/expansion effect, it allows you to get rid of unwanted background noise and expand the dynamic range of your audio signals. This makes it an ideal choice for professional audio processing in studios and live performances. The 564E is a high-quality dynamic range processor that provides excellent performance and reliability. It is suitable for use with a wide range of instruments and audio equipment, making it a versatile tool for any musician or audio engineer. With its sturdy build and intuitive controls, you can easily fine-tune your audio signals to achieve the desired effect.