The Analog control allows inconsistency to be introduced into the pitch and phase of the oscillator, which makes Omnisphere sound and behave more like a vintage analog instrument. When the Analog control is set to 50% and lower, it destabilizes the phase of the oscillator. After 50% it will also destabilize the pitch. As the Analog control is increased past 75% the pitch will become heavily detuned.
The Analog control is found in the Layer Pages, the Main Oscillator Zoom and in the Unison Oscillator Zoom.
NOTE: The Analog control has an affect on Unison voices too, so if Unison detuning is too drastic, it may be desirable to reduce the Analog control.