if i needed someone... he pedaled that low A all the way through. even live. anytime he played a low E...rain was played in A and slowed down to G. not sure if he played bass in A or G, but there are photos of that session as well and john and george are doing backing vocals, paul's on bass, so they probably slowed the tape back down for the bass/bkg vox. i'm assuming they were overdubbed at the same time, same track...funny you always hear about them using a loudspeaker as a microphone for bass, but i've seen no photos. surprising amount have surfaced...