User manual
effects
of feedback
6
modulation sounds different than positive-only
FM. Frequency shifting by increasing negative
amounts has a distinctive effect that at some
point, the original frequencies approach zero,
cross it, and then start to increase again (see
frequency being 300Hz, turning the shift
knob counterclockwise to the -300Hz position,
i.e., 30 with the x10 switch engaged (while lis-
tening to the up shifted outs
the original frequency, so the result reaches
hear it, the frequency appears to be increasing,
even though it actually moves towards -inf.
Interestingly, shifting a harmonic signal down
moves its fundamental to an inaudible DC. At
the same time, all the overtones move down by
one position, thus producing a harmonic signal
again. Further shifting, however, causes its fun-
frequency, as opposed to its other components,
which still decrease toward zero; thus, the sig-
nal becomes increasingly inharmonic.
THE EFFECTS OF FEEDBACK
Feeding a frequency-shifted signal back to the
input of the shifter creates a cascade of shifts
because part of the signal is shifted multiple
time-frequency response of frequency shifting with feedback
20 000
Gain
0
0
2
4
6
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10
5 000
10 000
15 000
0
0.2
0.4
0.6
0.8
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