@bslon: Is your A Whiter Shade Of Pale LP (A fantastic album!) a "stereo" pressing? I put stereo in quotes because the original U.S.A. A & M pressing was a "Reprocessed For Stereo" (fake stereo) only release. For that reason we Procol Harum fans sought the UK Regal Zonophone pressing, which was mono only. The only downside of the UK LP is that, as was the custom at that time in the UK, the LP did not contain the hit single!
By the way, in the late-90's/early-2000's, Classic Records reissued the album in a 200 gram Quiex SV-P vinyl pressing, and included a second 12" disc containing the song "A Whiter Shade Of Pale", 33-1/3 RPM on one side, 45 on the other. Also included is a 7" 45 containing an alternate take of the song on one side, the song "Lime Street Blues" (in true stereo) on the other. A fantastic release, imo worth what they now sell for.