Hi Michael, in anticipation of the new book thought I would ask this Question here.
In the video archive clip on this site for Joseph playing Sonny Boy circa 1955 he is clearly (to my eyes) using a number of barre chords. (From memory - I also think I spotted him doing this in the footage of Joseph, Grappelli et all playing sans Django in Paris on the A Life in the Jazz century DVD).
Now all of the various posts I have seen over the years on the yahoo site, your online lessons, Teds postings on the J'attendrai voicings, etc, etc suggest the Gypsy jazzplayers were more likely to use voicings with the thumb on 6th string and not the "modern" barre for example with root on 5th string, etc.
I note on your other clip of Joseph playing Bric a Brac you comment on how the musicians adopted US jazz styles and moved away from Django style e.g. flat four rhythmn. Do you think this is what happened with Joseph's rhythmn style or do you think he always played barre's?
Why do I think its important ? Surely any of the voicings is good enough? - well I'm focused on trying to get my rhythmn playing off pat before I even attempt soloing and over the last few years I have paid good money for a Nolan's book then found the voicings weren't matching the records, tried gadrodom but their charts and chord suggestions don't always match, noting Cosimini's voicings and some of the modern gypsy voicings don't match the original recordings either, and I am getting frustrated that my ears aren't hearing my fingers achieve that original joseph/roget/etc QHCF rhythmn sound.
Its like the postings on the Swing Blog point out I want to learn by developing my style through similar stages dajngo and joseph went through i.e trad jazz to swing 6ths to BeBop chords, etc.
So I can't quite wait to see what you have come up with in your new book!!