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The main difference between Oscillator 2 compared to Oscillator 1 is the fact that it provides more control over the Tune (Pitch) of the particular Waveforms.
Simple Waveforms (Sawtooth, Pulse, Triangle, Sine) as well as PCM provide Tune and Finetune controls.
Noise provides detailed Filter controls. (see Chapter: Noise (Oscillator 2)
Dual Sine provides independent Tune control for each Sine wave.
(see Chapter: Dual Sine (Oscillator 2)
Furthermore Oscillator 2 provides 3 different Tune modes.
The Tune faders are scaled to semi tones in a range from -63..+63.
The Tune faders are scaled to harmonic partials of the current Keyboard pitch in a range from - 38.0..+38.0, which makes it very easy to find harmonic Pitches (e.g. for Dual Sine FM).
This turns the Keyboard tracking off for Oscillator 2. In other words, in this mode Oscillator 2 runs on fixed (Keyboard independent) Pitch, which is controlled by the Tune fader in a range from 8.66Hz..12544Hz. This mode is very useful to create disharmonic FM or ring modulated sounds.
The Finetune fader has a fixed range of -50cents..+50cents and is not affected by the Tune mode.