Shades of Grey

Little Richard Penniman ... sure liked to ball ... Johnny Winter did an interesting version also.  The scroll bar (aka "slider") ...

OK, so Adriel asked for a better explanation of how to assign parameters to the panels, and how to link data in the 2 worksheets. Firstly...

You may seek him in the basement, you may look up in the air-- But I tell you once and once again, Macavity's not there!  (T S Elliot)...