Pressing Issues

Some copies of original editions have it too. I have three copies of Bitches Brew but only one of them has it. At least I hear nothing on the other two.

The most common source of the "problem" IS tape print through. You can hear it on CD reissues of music that was originally recorded to tape where the producers of the CD do minimal or no processing in the remastering process. Good examples are the incredibly well done, though expensive, Esoteric XRCDs.

Thanks for the responses everyone. I'm hearing it on Chick Corea/Return to Forever LP, ECM1022. It's from 1972, looks original but I could be wrong? I noticed the sax prior to it playing, between quiet passages, during "Crystal Silence".

Well, one way to actually cheack if it is tape print through or caused by adjacent track formation:
The mater tape print through will not be a perfect one lp rotation ahead of the actual track.
Where if it IS adjacent track issue then the faint modulation will be exactly one record revolution ahead every time.

Perhaps it is a manifestation of the "future absorber-past absorber" theory of radiation proposed by Fred Hoyle and his associate J. Narlacar [sp.?] in which events radiate equally into the past and future.