I hope some people find this contribution useful.
We'll talk about one of the most commonly used voicings in gypsy jazz. These voicings are based off of the half-diminished chord shapes:
(displayed from low E to high E)
These shapes can be transposed to the middle 4 strings:
Other shapes that involve the lowest E string are harder to use for multi-purpose stuff because sometimes they'll clash with the bass (e.g. 9th against the root) so I'll leave those out for now.
So these shapes can be used for min7b5, min6, and dom9 chords.
Bm7b5 is the equivalent to Dm6 and G9. With this in mind, try playing the different shapes on its equivalent m6 and dom9 chords over different changes.
An example on Minor Blues:
xx2333 -or- xx5756 -or- xx898,10 -or- xx12,12,11,12
(same as Gm6 shapes, moved up a 4th)
xx3323 -or- xx5666 -or- xx8,10,89 -or- xx11,12,11,13
(look at top part of this lesson)
(different voicing - an idea would be to move around diminished shapes)
I hope someone finds this useful.