User Manual
95
Prophet X User’s Guide
Modulation Techniques
Creating Movement with Pulse-Width Modulation
Another essential technique is to use an LFO to modulate the pulse-
width of the oscillator waveforms. This adds a great deal of movement
and thickness and has long been used to create string pads.
First, set up a simple square-wave sound.
To create a basic string sound:
1. Recall the Basic Program. (See previous examples if necessary.)
2. In the Mixer, turn up Oscillator 2 to 127. (Osc 1 is already at 127.)
3. In the oscillators section, set both oscillators to pulse.
4. Set slop 1&2 to 15 to add a little analog-type oscillator drift.
5. Display the Mixer parameters (turn either of the oscillator level knobs)
then press Soft Button 2 to select panning and set osc1 pan to -40L and
osc2 pan to 40R for a nice stereo spread.
6. Set lter cutoff to 117 and lter resonance to 20.
7. Set lter envelope attack to 11, decay to 60, sustain to 22, and release
to 50. Set lter env amount to 0.
8. Set amplier envelope attack to 87, decay to 60, sustain to 127, and
release to 50.
To add pulse-width modulation:
1. In the lfo section, select lfo 2 and set its shape to the triangle wave.
2. With the LFO 2 parameters shown in the main display, press Soft
Button 3 to select the lfo dest menu tab, then select osc1 shape with
Soft Knob 1.
3. Set LFO 2 frequency to 70 to set the speed of the pulse-width modula-
tion (osc1 shape modulation).
4. Set the LFO 2 amount to 65 to control the intensity of the pulse-width
modulation.
5. Now set separate pulse-width modulation for oscillator 2 for a more
random, organic feel: In the lfo section, select lfo 3 and set its shape to
the triangle wave.