Here's how to get to a new level of flexibility for your voicing adventures. When using major and minor 6th chords as described in Example 6, you can swap chord tones with notes from the diminished 7th chord built on the note one-half step below the root of the 6th voicing. For example, in a G6 chord, you can borrow or substitute notes from the F#dim7 chord - pretty much at your whim. When using dominant 7th voicings, you can substitute or borrow notes from any of the other three related dominant 7th chords. In (a), the Em7 voicing can be thought of as a G6 with an F# and A borrowed from F#dim7, the A7 is voiced with notes from G flat 7 and C7, and the Dmaj7 is voiced with an A6 that swapped an A for a G# from G#dim7. The second measure in (b) uses two different 6th chords over the Fmaj7: a C6 with an A flat and B from Bdim7, and a straight-ahead C6. Every voicing in these examples is either a mixture of notes from a 6th and a diminished 7th chord, or of notes from two related dominant 7th voicings. Play through them to get a feel for the kinds of sounds you can get with this kind of freedom.