A Case Structure "almost always" is "inside" of a Loop-like Structure, such as a While, For, or Event structure. The Reference wire should go into the Loop Structure, usually as a "tunnel" (since it is a Reference, and won't be changing from one Loop to the next) -- this assume you create the Reference before entering the Loop Structure, and destroy it after you exit, otherwise you should use a Shift Register which lets you create the Reference in the first Case (usually an "Initialize" Case) that uses the Reference, and lets you "destroy" the Reference in the last Case (usually an "Exit" Case) that uses it. Note that it is helpful when you are doing something like making "named Choices" (other than "True" vs "False") to name the Cases (like "Initialize", "Use", "Do FFT", and "Exit", which can be done in LabVIEW by either making them Strings (but then you need to be careful to spell the Case "selector", and have a "Default" case that catches your asking to "Do fft", which won't match "Do FFT") -- most "better" LabVIEW Developers use an "Enum" (look on the Front Panel for this) which we "name" and which don't need a "Default" case, but one Case for every Enum value you declare.
Bob Schor
