Is it the basilar membrane caressing effect due to light speed microvariations.
Also slight speed micro variations Fourier analyzed means side ands for every frequency.
So the final result is more total frequency spectrums together.
Is this a similar effect to Micahel Tretow engineer of Abba vari speeding tracks and adding them to the original tracks?
In the case of voices this meant formant change.
In the case of cassette does it mean micro formant change as the tape can't travel at exactly constant speed.
On cassette we also have premphasis and de emphasis. High pass at recording (constant current recording), high cut at reproduction rounding off any peak limited. Does this make an excellent treble limiter? See also how Mike Oldfield makes his guitar sound on interview and Bob Orban processing for FM broadcasting.
A similar pre, post emphasis is used on vinyl record cutting and reproducing. If a moving magnet cartridge is connected to a mic input all that is heard is high frequencies. This is the RIAA pre emphasis curve.
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