play this part throughout the verse's and chorus'
E|-------------------------|
B|-------------------------|
G|--10--10--12-------------|
D|--10--10--12-------------|
A|--8---8---10-------------|
E|-------------------------|
countinue playing the last chord until it starts again if you feel like it.

On the quiet part play it muted with an occasional chord.

E|---x----x-----------------|
B|---x----x-----------------|
G|---x-12-x-----------------|
D|---x-12-x-----------------|
A|---x-10-x-----------------|
E|---x----x-----------------|

As it speeds up play this repeatedly until it kicks back in with the main riff.

E|--------------------------|
B|--------------------------|
G|---12/13/12---------------|
D|---12/13/12---------------|
A|---10/11/10---------------|
E|--------------------------|