John used a chorus pedal during the Blood Sugar Sex Magik studio sessions to split his signal between a Marshall guitar amp and a Marshall bass amp—a setup he relied on for much of the recording. While he didn’t specify the exact model, the most likely candidate is the DOD FX65. However, it’s worth noting that not all tracks were recorded this way; on some occasions, John went directly into the board or used other Marshall amps.
I used two Marshalls: a guitar head for edge and a bass head for punch and low end. I split the signal with a DOD stereo chorus pedal.
Guitar Player (USA), October 1991
It’s also possible that this pedal was used during the closing section of “Under the Bridge.” However, it might have been a Boss CE-1 Chorus Ensemble instead, as John was known to use that pedal around the same time.
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You can see the DOD pedal on the documentary Funky Monks on a couple of shots. I think he used a combo of the DOD and CE-1 on the album.
John used the DOD chorus on stage at the Pinkpop festival on June 04th, 1990. This is 10 months before they started recording BSSM. The whole story about his Boss CE-1 breaking down in the studio so he went to a music store where they only had the DOD so he bought that one seems to be false.