TripleOscillator detuning?

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whats the difference between "course detuning" and "fine detuning" and why are there (separate) left and right knobs for the "fine detuning"?
Coarse detuning detunes by a semitone per "level", while fine detuning detunes in hundreths of a semitone.
Don't know the answer to the second question for sure, my guess is that the whole thing is stereo and that allows you to detune the different stereo waves differently.