Visualize a 130k resistor wired in series with a .001 uf cap. Then visualize one end of this contraption soldered to one non-ground volume pot lug, and the other end soldered to the other non-ground volume pot lug. It doesn't seem to matter which end goes to which lug.
A 250-500k "trim pot" in place of the resistor, would work nicely with either mod so that you could "custom tune" the affect to your particular pickup/pot/cap/amp/etc. combination.
You can also get "sockets" so that you can substitute caps without having to resolder evertime you want a change.
Here are some picture of it.
Last edited by WGTP; 09-01-2009 at 01:29 PM.