70
out:
So
far
you've
been using only
pink
noise
as your sound
source. Now
close
the input from the
noise generator
and try instead
feeding an
audio
signal
from VCOI
or VC03 into
the
filter.
Again
take special
note
of the very
general
and basic difference between
encv modulation of
the
filter F
c
and audio-frequencv modu-
lation
of
the
filter F
c
.
Repeat, with the signals from VCOI and then
VC03,
the
i
same
series of
investigations you performed with
pink
noise. Here
are
a
few more or less random
observations on some
of
the
things
to take note of.
1)
With
the
VCF
just below oscillation, and any periodic
waveform
as a
signal
input,
a
slow sawtooth will sweep
the
filter automatically through the harmonics
of
the
input waveform. (An automatic
version of the
experi-
ment you
performed in
5.1071.)
Initial Frequency
Audio
vco
Max
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