This walkthrough from Mastering.com's Logic Pro course covers ES2's oscillator section, the feature that gives this synth far more sound-shaping depth than the simpler ES1.
Each of the three oscillators pulls from waveforms like sine, saw, square, and FM, with octave and analog controls that introduce slight pitch imperfection for a more organic tone.
Oscillator 2 adds ring modulation and sync, locking its pitch to oscillator 1 for metallic, harmonically rich results instead of a plain pitch change.
Oscillator 3 goes further with noise and Digiwave wavetable sources (organ, bell, vocal tones) that layer under a sub bass or blend into richer, textured patches.