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
osc
1
pan
to -40L and
osc
2
pan
to 40R for a nice stereo spread.
6. Set filter
cutoff
to 117 and filter
resonance
to 20.
7. Set filter envelope
attack
to 11,
decay
to 60,
sustain
to 22, and
release
to 50. Set filter
env
amount
to 0.
8. Set amplifier 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
osc
1
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.
Summary of Contents for Sequential PROPHET X
Page 1: ...Samples Plus Synthesis Hybrid Synthesizer...
Page 2: ......
Page 12: ......
Page 151: ...139 Prophet X User s Guide Appendix D Troubleshooting and Support...
Page 169: ...157 Prophet X User s Guide Appendix E MIDI Implementation...
Page 170: ...158 Appendix E MIDI Implementation Dave Smith Instruments...
Page 171: ...159 Prophet X User s Guide Appendix E MIDI Implementation...
