The 008 / 008R VCO2 'Fine Tune' parameter is a ‘Linear Detune’ control.
Linear detune is a more natural form of detuning a second oscillator that has an increasing effect the lower the note that is played. It approximates a ‘constant beat frequency’ between the two oscillators, and means that the lower notes can sound richly detuned whilst at the same time the higher notes do not sound out of tune. To compare the effects, one can use fine tune on oscillator 1 as this uses ‘normal’ (exponential) detune.