I acquired this used and have used it very rarely. It's a highly versatile programmable switcher. It was working without any problems in my setup. JOYO's affordability is something only they can offer; it would be quite expensive from other companies. You can use it in various ways depending on how you connect it. It supports MIDI, but I haven't used it, so the MIDI functionality is untested. It can also switch amplifier channels, so I was using it like this: "LOOP1" → Amplifier → "LOOP2" In this way, I was using the amplifier's distortion in between. Please supply power with DC9V center negative. Cables are not included. I was connecting it to a power supply. I'm hesitant to sell it, so I might remove the listing suddenly. If you want it, please don't delay.