On Saturday, 9/10/18, I received my 976 and 5000 amp, both of which are delivering exceptional performance/$$. More on that in a future post. When configuring the various inputs, e.g., CBL/SAT, one of the surround options was Auto which I chose. However, this is a mystery option as there is no information about it in the manual. This merits a deduction of a few points after my many years of experience with Lexicon MC-12B documentation -- yes, there is a major disparity in price point, but documentation!!!