ARP 2600 - Initial Patch Experiment: VCO3-VCF-Mixer

48
Use this
basic patch
to
acquaint
yourself with
the behavior of
the oscillators
including
their
frequency ranges, tonal character of
their audio
waveforms,
and
so on;
with the action of
the low-pass
filter,
on signals fed into
it,
and
with the
dispensability of the ampli-
fier
when it
is
subject
only
to manual control. Let's do
this
one thing
at
a time.
Begin
with the
following settings
(and
return to
them
when-
ever
later
in this
chapter, we say something like "start
from
the begin-
ning" or words
to that effect. If
you
need to
know "where
to start",
this
is it!):
a)
All input attenuators and output
level controls at their
minimum, or
off, position. This is always down for vert-
ical sfiders and
left
for
horizontal sliders.
b)
All
VCO control
sliders, including the pulse-width con-
trols on
2 and 3
centered; range switches to audio
position.
c)
VCF
initial frequency
and fine tune sliders
at maximum,
i.e.,
extreme
right;
resonance slider
at
minimum, i.e.
extreme left.
d)
all
envelope-generator
control sliders at minimum;
gate
selector
switch to
keyboard—upper—position.
VCA initial
gain control to
maximum—right—
position.
f) panpot
centered, reverb
minimum.
g)
noise generator controls
centered,
h)
on
the
keyboard, all three switches
at
the front should be
in their
right-hand
position.
i)
anything
we haven't
mentioned
either
is covered implic-
itly
in
a—
g
or doesn't matter.
j)
the best
course to
take with the
speaker volume controls
is
to
leave them about
three-quarters
of the
way open and
then change the volume
whenever you feel like it.
NOW
5.101
Open fully
the Mixer input
from the VCF
and the
VCF
input
from VCO-3
(after this
we'll
refer
to
these as simply "VCF-Mixer"
and
"VC03-VCF"
inputs
respectively,
and use the same
shorthand for
other prewired
connections); you
should
hear a
medium-low,
humming
tone from the
speakers.