Series-Split-Parallel Wiring Modification

I modified the wiring of my Washburn WI-64 (Idol) guitar, but the new circuit can be applied to any dual-humbucker guitar as long as the humbuckers are splittable (4 leads plus ground).

The original WI-64 wiring has Washburn's VCC (voice control contour) circuit. The VCC allows subtle blending of series and parallel sounds. However, it doesn't permit true single-coil operation and doesn't leave room for a conventional tone control. Moreover, Washburn wires the guitar with separate volume controls for each pickup, which makes quick volume adjustments difficult.