Old Tele Man,
Thank you for your help, but Im afraid that this is not what Im looking for. If you look to page 2 of the Q-filter sticky thread, youll see that Bill refers to L, EQ1, EQ2 configurations of the Q-filter and also to standard tone. This diagram you post seems as the one Bill exemplifies in the drawing (from L filter to standard tone). What Im looking for is a way to change from L filter to EQ1 or EQ2. As I understand, in the L filter the RC are in series with the inductor, and in the EQ system, the RC are in parallel. Can it be done with just one push-pull pot?
Also, Im a chemical engineer and although Im able to read circuits, I have difficulty to translate them to into the "real" world, so I need drawings in the style of what we find at sites as Seymour Duncan or Guitar Electronics, for instance.
Thanks,
Waltriani