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Front panel controls and rear panel connectors. Specifications P. 53 4 X 18R/20R Block Diagram X 18R™ / X 20R™ Owner’s Manual How To Use This Manual Format This manual uses a format that is intended to be easy to read, yet technical enough for those who need to know all the details. For feature descriptions, this is done by devoting the left side of each page to 1) an overall module picture, 2) a block diagram, and 3) a control closeup. These images all pertain to the features and control descri