Russell uses two delay pedals for the verses and choruses, the first one set to sixteenth notes at roughly 146 BPM and the second one set to eighth notes at the same tempo. Both have a high feedback setting. He uses a line selector to switch between the two pedals. There's a very helpful video on YouTube by Total Guitar entitled "Bloc Party - Octopus guitar lesson - Riff Of The Month" that explains the procedure better than I can. Verse Am A E|----------------------------------------------------------------| B|----------------------------------------------------------------| G|--------5---------------5---------------6---------------6-------| D|--------7---------------7---------------7---------------7-------| A|12\-------------12\-------------12\-------------12\-------------| E|----------------------------------------------------------------| E|----------------------------------------------------------------| B|----------------------------------------------------------------| G|--------5---------------5---------------6---------------7-------| D|--------7---------------7---------------7---------------7-------| A|12\-------------12\-------------12\-------------12\-------------| E|----------------------------------------------------------------| Chorus - same delay effects and pattern as verse, but each chord for 4 beats instead of 2. F Am F Am F Am C G E|-----------------------------------------------------------------| B|--------------------------------------------------------3-------| G|10------9-------10------9-------10------9-------9-------4--------| D|10------7-------10------7-------10------7-------10------5--------| A|-----------------------------------------------------------------| E|-----------------------------------------------------------------| Break - uses the same pedal set to sixteenth notes. E|10p9-10p9-|13p12-13p12-|16p15-16p15-|19p18-19p18-| B|----------|------------|------------|------------| G|----x4----|-----x4-----|-----x4-----|-----x4-----| D|----------|------------|------------|------------| A|----------|------------|------------|------------| E|----------|------------|------------|------------| Solo - Distortion and Wah pedal. Am E Am E E7 E|8p0-5p0-|7p0-4p0-|8p0-5p0-|7p0-4p0-|10p0-7p0-| B|--------|--------|--------|--------|---------| G|---x8---|---x8---|---x8---|---x6---|---x2----| D|--------|--------|--------|--------|---------| A|--------|--------|--------|--------|---------| E|--------|--------|--------|--------|---------| Am7 Amaj7 Am7 Amaj7 E|15p12-------|17p16-------|15p12-------|17p16-------|19-19-19-19-| B|------13p10-|------17p14-|------13p10-|------17p14-|------------| G|------------|------------|------------|------------|------------| D|-----x8-----|-----x8-----|-----x8-----|-----x4-----|-----x4-----| A|------------|------------|------------|------------|------------| E|------------|------------|------------|------------|------------|