You'll notice that when great flamenco players do those extreme rapid scalar runs their RH knuckles are dead parallel with the strings all the way from top strings on down through the low E string using many times, i m, i m, i m,
or, i a, i a, i a..only, with fingers out straight/rest strokes, usually..
You can do that or employ your thumb in the normal fashion on the bass strings. What's the mystery ? Never thought there was a question over this... M
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