This is a Mackie 1604-vlz3 mixer. It was overhauled by the manufacturer about 3 years ago. It has been working without problems since then. I haven't checked every channel, so there might be some crackling, but please consider it to be in the condition of a typical used analog mixer. Please refrain from purchasing if you are looking for a perfect condition or are overly concerned about details. Feel free to ask any questions you may have. I will do my best to pack it so that the faders and other parts are not damaged, but please understand that I am an amateur packer.