This is my Korg Triton Rack module. The knob is a little finicky but still works fine. The buttons are all nice and responsive. The video shows me testing all the outputs (L, R, 1, 2, 3, 4) and they all work fine. I used to hate these things when they first came out but I didn't realize how strong the synth section is. I've done some sampling on it which works pretty well also even though it's got very little storage. Has the usual wear from being in and out of racks. Comes with 3rd part power adapter.