9

Using Pulse Width Modulation in the ES2
You can alter the tonal color of rectangular waveforms by scaling the width of waveform
pulses to any value. This is known as pulse width modulation.
The pulse width modulation features of the ES2 are extensive. As an example, if rectangular
waves are chosen for all oscillators, you can simultaneously modulate the pulse width of
Oscillator 1 and the synchronized pulse waves of Oscillator 2 (or the square wave of
Oscillator 2’s ring modulator) and Oscillator 3.
To set a basic pulse width in Oscillator 2 or 3
µ
Drag the waveform rotary control in the area highlighted in the image above.
Only Oscillators 2 and 3 allow you to define a “base” pulse width, prior to any pulse width
modulation.
To set up a pulse width modulation routing (of Oscillator 1) in the router:
1 Choose Osc1Wave as the Target.
2 Choose LFO1 as the Source.
3 Adjust the modulation amount slider (a value of 0.12 is subtle, but sweet).
4 Choose a sine wave for LFO 1.
5 Adjust the LFO 1 Rate (0.160 Hz is nice for slow sweeps).
52 Chapter 5 ES2