Dave Smith Instruments Sequential PROPHET X, User Manual, Page: 109 / 172

97 Prophet X User’s Guide Modulation Techniques
7. Use s
oft
k
nob
2 to scroll through the various mod sources and choose
lfo
3.
8. Use s
oft
k
nob
3 to set the amount to -20.
9. Use s
oft
k
nob
4 to scroll through the various mod destinations and
choose
cutoff
r.
10. Hold a chord and notice how the sound moves as the cutoff frequency
changes on the left and right channels of the filter.
11. Increase the filter
resonance
to make the effect more dramatic.
Creating Sounds Using FM (Frequency Modulation)
Frequency modulation is a technique where the frequency of one oscil-
lator modulates another oscillator, producing complex harmonics. This
is how instruments such as the DX7 produced its sounds. In classic FM
instruments, sine waves were used. But because the mod matrix makes
it possible to route any of the Prophet X sound sources to each other
(including sampled instruments), the sonic possibilities are even greater.
To create sounds using frequency modulation:
1. Recall the Basic Program. (See previous examples if necessary.)
2. In the Mixer, turn up Oscillator 2 to 127.
3. Turn Oscillator 1 level down to 0. (Because we’re going to use it as a
mod source, we don’t actually want to hear it.)
4. In the
oscillators
section, set both oscillators to
sine
.
5. In the
modulation
section, press the
assign source
button. Use s
oft
k
nob
1 to scroll to the first available mod slot.
6. Use s
oft
k
nob
2 to scroll through the various mod sources and choose
osc
1.
7. Use s
oft
k
nob
4 to scroll through the various mod destinations and
choose o
sc
2
freq
.
8. Now, repeatedly play a note and listen to what happens while you use
s
oft
k
nob
3 to slowly increase the modulation
amount
to 127. The
sound becomes more gong/bell-like.