This is inspired by the recent tone cap thread.
Instead of a tone knob on my main guitar, I installed a three way tone switch. In one position, there is no capacitance. In the two other positions, a capacitance is placed across the output: 1nF and 2nF, respectivelly. There is no series resistance at all. Though I do not have a continuously variable tone control this way, the use of a pure capacitance means the resonant peak in the response is retained. The pickup and the capacitor form an LC resonant tank. Without resistance in the circuit, the resonant tank is undamped. A regular tone control kills the resonant peak as you turn it down. A peak then reappears when the control is turned all the way down.
I just recorded a quick little MP3 with my smartphone to demonstrate the switched cap setup. This guitar has only one pickup, a DiMarzio DP-156 "Humbucker from Hell" in the bridge. "Tone One" in the clip is with the 2nF capacitor across the pickup, the most rolled off tone. From there it progresses to "Tone Two", with the 1nF capacitor across the pickup, and then to "Tone Three" which is just the straight tone of the DP-156 without any shunt capacitance, other than that of the instrument cable and preamp's FET input.
The effect is like having three pickups in one.