Osc 1 stays static (can't fine detune without modulation matrix being used).
Osc 2's maximum detune lies, oddly, within a range of +43 to +80 cents depending on the frequency of the note played. When fine-detune is maxxed (Osc 2 detune value = 127), low frequencies (subs) notes are detuned by +80cents, mid notes +50cents, while higher notes are in the mid +40's.
Let's just say a fine-detuning value of 127 pitches up the oscillator by an average of +50 cents (half a tone).
Osc 3, is the same as Osc 2, but detunes in the negative direction with respect to Osc 1. Therefore it will pitch down a maximum of -50cents (on average).
When Osc3 is set as a Slave to Osc2, Osc3 uses the same detuning as Osc2 but again the detuning is negative instead of positive. So if Osc 2 has a fine-detune value of 64, which is approx +10cents with respect to Osc1, Osc 3 will automatically be detuned equally in the opposite way, which will be -10cents with respect to Osc1.
Osc 2 and Osc 3 will always be on opposing sides of Osc 1. (Unless you modulate Osc 2 or 3 individually using mod matrix).
In general, detuning is also not linear, but curved (logarithmic). At a middle detune value of 64, notes are only pitched up by +10 cents, which means that Osc 2&3 fine-detune values of 0-64 are extremely fine. The rest (65-127) are increasingly steeper, and make up the rest of the full detune range.
The Sub-Osc is static at -1octave to Osc1. If you change the semitone detune of Osc1, this will also affect the Sub Osc by the same amount.
PS > If you want accurate measurements of notes using an external tuner, PureTuning needs to be set to Pure, otherwise the Virus oscillator emulates random analogue pitch instability +/- 4cents each time a key is pressed.
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