Please read the following description and profile. I was using this until the end of the year, but I'm selling it because I bought a new audio interface. There are no operational problems, but there is crackling in the right speaker when raising or lowering the volume. I think there was crackling in the headphones too, but I don't remember clearly. I have never used the MIDI input/output, so their operation is unconfirmed. The protective vinyl is still attached to the surface and hasn't been peeled off, so I think a clean surface will appear if you peel it off.