Soft and hard tension natures on a flamenco guitar (pulsacion and beyond) Ruben Diaz CFG Spain

The last word about "action" in flamenco guitars <br />https://youtu.be/T5grenEYuCA?t=2m16s <br />"Pulsación" and Beyond http://youtu.be/X1_bUg62QOA?t=14s