tuning : drop c

----------------------------------------------------------------|
----------------------------------------------------------------|
----------------------------------------------------------------|
0-2-3-5-6-7-------------0-------------0-000000------------------|
0-2-3-5-6-7-------0h1p0-0-------0h1p0-0-000000------------------|
0-2-3-5-6-7-0h2h3-------0-0h2h3-------0-000000------------------|
                                        pm....

----------------------------------------------------------------|
----------------------------------------------------------------|
----------------------------------------------------------------|
-------------0-------------0--000-------------------------------|
-------0h1p0-0-------0h1p0-0--000---x2--------------------------|
-0h2h3-------0-0h2h3-------0--000-------------------------------|
                              pm..

-----------------------------------------------------------------|
-----------------------------------------------------------------|
-----------------------------------------------------------------|
-000-7p0--000-7p0----000-8p0--000-8p0--000-8-8--000-8-8----------|
-000-7p0--000-7p0-x2-000-8p0--000-8p0--000-8-8--000-8-8----------|
-000-7p0--000-7p0----000-8p0--000-8p0--000-8-8--000-8-8----------|
pm...     ...        ...      ...      ...      ...