Right channel does not work on all 3 speaker banks. The LEFT channel works correctly. All lights work on the panel as they should. Including the cool reverb one. All nobs work including the EQ sliders. It sounds warm and powerful on the one channel. This is a very rare unit, I'm going a different direction with my set up. Should be a easy fix for those that know what they are doing. Hope it goes to a good home where it is enjoyed in all its glory.