Drop D tuining
e----------------------------0-----------------------------------0
a--------------------------2-1---------------------------------2-1
d--------------------------3-0---------------------------------3-0
g--------------------------0-0-----------0-2-2-2-0-0-0-3-3-3-0-0-0
b-0-3--------0-0-0---------3-3-0-2-2-0-3-0-2-2-2-0-0-0-3-3-3-0-3-3
d-0-3-4-0-0-0-----3--3-2-2-3-0-----------0-2-2-2-0-0-0-3-3-3-0-3-0