Creating Sounds Using Fm (Frequency Modulation) - Dave Smith Instruments Sequential PROPHET X User Manual

7. Use s
oft
3.
lfo
8. Use s
oft
9. Use s
oft
choose
cutoff
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

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
5. In the
modulation
k 1 to scroll to the first available mod slot.
nob
6. Use s
oft
1.
osc
7. Use s
oft
choose o
8. Now, repeatedly play a note and listen to what happens while you use
s k
oft nob
sound becomes more gong/bell-like.
Prophet X User's Guide
k 2 to scroll through the various mod sources and choose
nob
k 3 to set the amount to -20.
nob
k 4 to scroll through the various mod destinations and
nob
r.
resonance
section, set both oscillators to
section, press the
k 2 to scroll through the various mod sources and choose
nob
k 4 to scroll through the various mod destinations and
nob
2 .
sc freq
3 to slowly increase the modulation
to make the effect more dramatic.
assign source
Modulation Techniques
.
sine
button. Use s
oft
to 127. The
amount
97