Gosh, a one man thread
I'll chip in.
I made a field trip down there in 2011, predominantly Galicia and the two halves of the Basque region. Clutch failure in the old Mondeo kept me from crossing the Pyrenees a third time to sample Catalonia, but I had a week with a gifted young Catalan clarinetist a year ago.
These are all vibrant, very *living traditions, as I think the mp3 exemplifies. As such both rhythmic and chord variation reflects more of the accompanist's interaction with the dancers than anything written down on a stave, and these accordeon styles are as "right handed" as anything I've come across.
As such I think we should regard any left end notation as "indicative", perhaps merely a suggestion as to the direction of bellows travel! I think one has to see and experience the dances to half understand the rhythms going one. Hope this helps, but I've probably just made things worse. 4.2. Aproximació al concepte de música tradicional
.. As (it would seem to) say in the source document - which even has a section on tsheng
Yup, gotta go there. Barcelona is a good "hub" for low cost airines. Fancy a field trip when you come to Europe?