Technical data
excursion.
When
the
CONTOUR
AMOUNT
control
is
moved
into
the
negative
region,
the
contour
is
inverted;
this
inverted
contour
then
causes
a
reverse
contour,
or
a
falling-and-rising
excursion
of
the
cutoff
frequency.
The
CONTOUR
AMOUNT
control
is
internally
arranged
with
the
CUTOFF
control
to
minimize
the
need
for
adjusting
the
CUTOFF
control
when
going
from
normal
to
reverse
contours.
As
the
CONTOUR
AMOUNT
control
is
moved
progressively
negative,
the
CUTOFF
control
is
moved
(internally
and
electrically)
progressively
positive,
and
conversely.
In this
way,
sound
will
not
be
completely
"cut
off"
by
the
filter
as
a
result
of
a
deep
reverse
contour.
Here's
another
way
to
look
at
this—as
panel
graphics
indicate,
normal
contours
start
6e/ow
the
nominal
filter
cutoff
frequency
as
set
by
the
CUTOFF
control,
and
reverse
contours
start
above.
This
makes
possible
the
use
of
various
contours
without
constant
readjustment
of
the
CUTOFF
control.
which
can
last
no
longer
than
the
settings
of
its
ATTACK
and
RELEASE
timing
controls
allow,
regard
less
of
how
long
a
key
is
depressed.
In
the
maximum
sustain
mode
to
the
left,
the FILTER
CONTOUR
generates
a
three-part
contour
/wmf
pm
t
whose
middle
portion
will
be
sustained
as
long
as
a
key
is
depressed.
In this
case,
the
RELEASE
part
of
the
contour
becomes
operable
only
when
all
keys
are
released.
13
RELEASE
Controls
timing
of
the
last
(falling)
part
/ %
of
the
filter
contour
from
1
msec,
to
10
seconds.
The
RELEASE
control
is
operable
over
its
full
range
only
when
the
RELEASE
switch
in
the
row
of
switches
is
switched
to
the
left.
FILTER
CONTOUR
The
FILTER
CONTOUR
is
an
envelope,
or
contour
generator
that
produces
a
control
signal
which
rises
and
then
falls,
and
which
is
used
to
control
the
cutoff
frequency
of
the
filter.
Controls
in this
section
are
used
in
conjunction
with
the
FILTER
SUSTAIN
switch;
consequently
this
switch
will
also
be
discussed.
FILTER
SUSTAIN
m
12
ATTACK
Controls
timing
of
the
initial
(rising)
^
of
the
filter
contour
from
1
msec,
to
part
W
10
seconds.
FILTER
SUSTAIN
A
level
switch
rather
than
a
timing
control.
This
switch
determines
whether
or
not
the
FILTER
CONTOUR
voltage
level
will
be
sustained
at
a
maximum
when
a
key
is
held.
This
switch
determines
whether
the
contour
produced
will
have
(wo
or
three
parts.
Inthenon-sustain
mode
to
the
right,
the
FILTER
CONTOUR
will
generate
a
two-part
contour
s^\
LOUDNESS
CONTOUR
The
LOUDNESS
CONTOUR
is
a
second,
independent
contour
generator
which
is
connected
internally to
the
control
input
of
the
voltage
controlled
amplifier
to
create
articulations,
or
loudness
contours.
Controls
in this
section
are
used
in
conjunction
with
the
LOUDNESS
SUSTAIN
switch;
consequently
this
switch
will
also
be
discussed.
ATTACK
/V
RELEASE/V
LOUONESSCONTOUR
LOUDNESS
SUSTAIN
r~n
14
ATTACK
74
Controls
timing
of
the
initial
(rising)^"
\
part
of
the
loudness
contour
from
1
msec,
to
10
seconds.
LOUDNESS
SUSTAIN
A
level
switch
rather
than
a
timing
control.
This
switch
determines
whether
or
not the
LOUDNESS
CONTOUR
voltage
level
will
be
sustained
at
a
maximum
when
a
key
is
held.
This
switch
determines
whether
the
contour
produced
will
have
two
or
three
parts.
In
the
non-sustain
mode
to
the
right,
the
LOUDNESS
CONTOUR
will
generate
a
two-part
contour
/^\
which
can
last
no
longer
than
r