This is an audio interface I purchased around October of last year and used when I first started DTM (desktop music production). I am selling it because I have since upgraded my equipment. I tried using it by connecting it to my PC, but I couldn't set up the drivers properly at the time and couldn't use it effectively. I'm not sure if the problem was with the model, my environment, or my lack of knowledge. Therefore, I am selling it as untested and in its current condition. I recommend this to those who are familiar with equipment or who can set it up and adjust it. There is no significant damage to the main unit, but due to the used condition and the above-mentioned circumstances, please understand this before purchasing.