The Logic Selector is a minor variation of the existing Logic State block: the outputs of the Logic Selector block are mutually exclusive, allowing only one output to be high at a time. When a TEC-1 o...The Logic Selector is a minor variation of the existing Logic State block: the outputs of the Logic Selector block are mutually exclusive, allowing only one output to be high at a time. When a TEC-1 or HD-1 is connected to the inputs of the Logic Selector, feedback information is passed from the Logic Selector to the TEC-1 or HD-1 for visual indication of currently selected item.