MM....well, yes, there is a psychoacustic property called frequency masking. Basically above a certain threshold, frequencies will cover up other frequencies.
Its weird that it happened on a recording like that, since someone would've noted it. And it's never so extreme as to completely mask it.
Another posibility is that if you were inputing it thru an unbalanced 1/4" input, and using a TS jack in the console end, you had phase cancellation due to the vocal being mixed in mono and the balancing circitry flipped the phase on your vocals. I've had this happen before. Its kinda weird sounding, as you only hear the reverb which is in stereo.
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Ignacio \"Iņaki\" Rosenberg
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