The main effect of course is the Electro Harmonix â€œramâ€™s headâ€ Big Muff fed into a Hiwatt DR103 head with a WEM speaker cabinet and a Yamaha RA-200 rotating speaker.

Some sources also suggest that he used an Electric Mistress flanger but Iâ€™m having a really hard time hearing it. The first demo recorded by the band â€“ sans the orchestra â€“ includes a MXR Phase 90 but this was ditched on the final version. There are different reports on what effects David used for the sessions. The guitar still had the DiMarzio FS-1 bridge pickup but was newly fitted with a custom Charvel maple neck. David used the Black Strat for the two solos and the power chords during the main solo. The guitars were recorded sometime early autumn 1979. The demo from the first band sessions also includes Davidâ€™s fuzz chords on the verses, which came back on the 1980s and 90s live version but was not included on the album. David though the first version was too sloppy and liked the second slightly tighter take. According to an interview with David from Guitar World in 1993 the issue was Nick Masonâ€™s drumming. The recording of the song for The Wall caused a lot of tension between Roger and David. David far away on another planet in Amsterdam 2006.

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