If you are looking to get more tonal control, you can quickly mod your swtc with additon of two caps.. in place of the C5, solder a 10n cap. The removed 4n7 cap should be soldered across the lugs 1-3 of the pot, and add a 1n cap (or something smaller for more treble) between lug3 and ground. Easily added "mid-shift" control with pot-position extremes similar to a standard swtc.