only let first two ring
e| |-3-----------5-----------5-----------5----------|
B| |-3-----------5-----------6-----------6----------|
G| |-4-----------6-----------7-----------7----------|
D| |-5-----------7-----------7-----------7----------|
A| |-5-----------7-----------5-----------5----------|
E| |-3-----------5-----------x-----------x----------|