A point to keep in mind is that when the setting of the phase switch is changed, not only is the polarity of the recording being inverted, but the configuration of the circuitry in the preamp is being changed. That in itself can be expected to sometimes affect the sound, to a greater or lesser degree depending on the specific design.
Also, seconding Jfrech's point, my understanding is that most recordings in most genres are produced via heavy multi-mic'ing (i.e., a lot of microphones) together with subsequent mixing and processing in elaborate electronic consoles. With the result that neither polarity setting stands much chance of being correct for all of the performers and/or their instruments.
Regards,
-- Al
Also, seconding Jfrech's point, my understanding is that most recordings in most genres are produced via heavy multi-mic'ing (i.e., a lot of microphones) together with subsequent mixing and processing in elaborate electronic consoles. With the result that neither polarity setting stands much chance of being correct for all of the performers and/or their instruments.
Regards,
-- Al