Please be sure to read the entire description and purchase only if you agree. Returns are not accepted after purchase. This is a custom-made 12 in 10 out stereo matrix mixer. All jacks are 3.5mm stereo mini jacks. Power is supplied by a center-negative 9V adapter with a current rating of 500mA or more. When looking at the jacks from the left side, the left column is the output and the right column is the input. The color of the knob indicates which output the signal is routed to. The leftmost red knob outputs the input from the frontmost input to the frontmost output. The toggle switch at the back is the power switch. In front of that, there are three vertical toggle switches, which are individual on/off switches for the three outputs equipped with the black knob (output 10). Basically, only one of the three toggles should be switched to the left to turn it on. Turning on multiple toggles may reduce the volume of output 10. When connecting a mono effects unit, please use a stereo to mono conversion cable. Connecting a mono mini cable may cause a short circuit. [Reason for Junk Sale] I have confirmed that all knobs, inputs, and outputs function as designed, but the unit's power will shut off when connected to equipment with high current consumption. In my case, this symptom occurs when connecting the 1010music bluebox or blackbox, which I use as my main equipment, so I have given up using it and am selling it. This is a custom-made product. After close communication with the manufacturer, I received a response that although the above symptoms may occur depending on the equipment connected to this unit, the matrix mixer itself has no problems. This unit alone (excluding the knobs) cost approximately 140,000 yen, and the 120 coolor caps knobs cost approximately 50,000 yen, for a total of approximately 190,000 yen. This is being sold as a junk item. No claims and no returns. Recommended for those looking for a larger matrix mixer than the pladask elektrisk stereo matrise.