Mr Spock
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By now, most serious phonophiles recognize the need to properly align a phono cartridge relative to both the tonearm that holds it and the center of the turntable's platter, to minimize lateral tracking error. LTE is created by discrepancies between the radial line traveled by the cutting stylus when an LP's master is created, and the arc traveled by the playback stylus of a cartridge mounted in a pivoting tonearm—discrepancies that result in measurable and audible distortion.
As Brakemeier suggests on the Acoustical Systems website, he developed his alignment scheme with some specific goals in mind, not the least being even lower distortion from an LP's innermost groove—for which the UNI-DIN curve trades "slightly higher [deviation] at the beginning of the groove—where the overall working conditions for the stylus are the best." Arguably more important was Brakemeier's goal of creating a curve in which increases in distortion are less drastic than in any other alignment—something he says is critical because "the human ear . . . is very sensitive to changes." Brakemeier suggests that the UNI-DIN distortion curve is "actually flatter than the other curves, in the sense that the inevitable dips and peaks of [deviation] in the tangential curve are smoother—less steep/fast in both directions."
https://www.stereophile.com/content/listening-191-smartractor
SMARTractor video part 1 - introduction and description
SMARTractor video 2 - aligning a cartridge / tonearm with the SMARTractor
SMARTractor Video tutorial part 3 - setting P2S with the SMARTractor
