The Voodoo-1 circuit is on the High Band and the Voodoo-Bass on the Low Band. Many top players use both of these circuits and now you have the choice of both to adjust and blend together. The two types of distortion are complimentary harmonically and the Voodoo XX explores the sonic blending of them together to the max.
The Low and High Band circuit path channels have individual Drive and EQ controls that been optimised for the type of circuit being used. The resulting range of sounds available is truly immense as varying amounts and types of Processing and EQ can be applied to each channel or band and then mixed together. This is a technique we used in the studio with Jimi to get the required tone. Using various pedals in series or equalisation will not accomplish this as processing is then applied sequentially and to the whole frequency range.