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236 Chapter 22 ES2
Waveforms of Oscillators 2 and 3
Basically, Oscillators 2 and 3 supply the same selection of analog waveforms as
Oscillator 1: sine, triangular, sawtooth, and rectangular waves. The pulse width can be
scaled steplessly between 50% and the thinnest of pulses, and can be modulated in a
number of ways (see “Pulse Width Modulation” section, on page 236).
Oscillators 2 and 3 also offer the selection of:
• a rectangular wave, synchronized to Oscillator 1,
• a sawtooth wave, synchronized to Oscillator 1,
• a ring modulator, which is fed by the output of Oscillator 1 and a square wave from
Oscillator 2,
• colored noise for Oscillator 3.
Synchronization and ring modulation afford the creation of very complex and flexible
harmonic spectra. The principle of Oscillator synchronization is described on page 237,
and ring modulation on page 238.
Pulse Width Modulation
Oscillators 2 and 3 allow you to scale the width of the pulses to any value. The
spectrum and tone color generated by these oscillators depends on the pulse width.
The pulse width can be modulated. You can even modulate the pulse width of the
square and pulse wave of Oscillator 1, the pulse width of the synchronized pulse waves
of Oscillator 2 and 3, and the square wave of Oscillator 2’s ring modulator.
This width modulation is controlled in the Router (the Modulation Matrix). The pulse
width is defined by the waveform rotary control. The graphic below shows a pulse
wave, with the pulse width modulated by an LFO. You can clearly see how the width of
the pulses changes over time.