I am posting these pics and I am pretty sure none of you have this item. I picked it up from a Japan Auction House in mint condition. The color scheme on it is vintage and the build quality is very good. I have a synthesizer rack and use this device as an optional pass through if I feel the sound output is inadequate pre mixer. It gives you the option to also add three effects loops and trigger each one individually or run them simultaneously. The Low, Middle and High Tone controls each provide a frequency sweep control to locate the problem area and adjust level. The Low and Middle have an additional bandwidth control for range of adjustment. Unfortunately I was not able to locate any manuals or documentation for this unit.