Here is a great video where they built a board that allows you to instantly switch between tone caps on a given guitar....
I've heard that, but I'm very curious too....
Curiosity is good. If I can quote the motto of The Royal Society (the world's oldest and most prestigious scientific institution) "Nullus in verba - Take Nobody's Word For it".
Now to figure out what tone cap value to put into my H-H Stratocaster. Most H-H setups use a .022uf (the Gibson H-H standard for years) but still many prefer the .047uf, which I think would make the Gibson 57 Classics (Alinco II 7.8k) too dark.
Thoughts????
It only does things when you wind the control back - light and dark are really descriptions of the pickup with the tone control at 10, where the cap makes no difference.
Correct, Sir...
But what I want is a gradual roll back without muddy-ness....
Right - then you need to be exploring the lower values, not the higher. Connect a couple of wires to the points in the guitar where the tone cap goes and bring them out to croc clips. Then you can experiment with values in a more-or-less normal playing situation.

Currently, I have only .022uf's on hand (on the low end) so I am looking at perhaps a .010uf or .015uf, wired "50s Style" as to not affect volume. I think I have this figured out now....