Interessante analisi sul suono del fusto...
https://www.youtube.com/watch?v=xnmLVURn6hk
https://www.youtube.com/watch?v=NFkna_Vl-CU rimarrete di stucco, grande, e via pippe mentali , fantastico !!!!!
https://www.youtube.com/watch?v=OSJCGL7MdZ4
https://www.youtube.com/watch?v=3GB-B0fqr3c