This is a compressor famous for being used by Daft Punk and supporting sidechain. It has a very distinctive sound, so it's recommended for those tired of the sound of DAW processing. It was used for recording, etc., so there shouldn't be any major issues, but it hasn't been precisely inspected, so please refrain from purchasing if you are concerned about minor details...! A famous hack is to gain sound pressure by using a high-amp power supply, and an adapter that supports this is also included. As it will only become harder to obtain in the future, please consider it if you are interested.