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The
ATTACK
TIME
control
is
calibrated
with an
arbitrary scale
because the
attack
time
is
automatically
varied
according
to
the
nature of the
program
material. This
minimizes
audible
compression-induced
side-effects.
Because
the
range
of
the
ATTACK
TIME
control
has purposely
been
made
very
wide,
certain
sounds can
cause
the
422A/424A
to
produce
distortion
when
operated
with
fast
attack
times.
Such
sounds
include
certain
male
voices,
Hammond
organ,
and
some
types
of
bass
(particularly
synthesizer-produced).
Such
distortion
can be
totally
eliminated by operating with slower attack
times
—
usually
between
"5"
and
"SLOW"
on
the
dial.
4)
Adjust
the
RELEASE
TIME
control
to
determine
how
fast
the
422A/424A
gain
recovers toward
maximum
during those
times
when
its
output
level
is
below
the
threshold of
compression.
Fast
release
times produce
the
greatest
"density"
and
most
consistent output
levels.
However,
they
also
create the greatest
risk
of audible side-effects.
They
are most
useful
in
recording
studios or
production
situations
where
the
program
material
being
processed
is
a
single
track
and
is
to
be
mixed
with
other
material.
Slower
release
times
generally
produce
a
more
natural
sound on
mixed program
material.
Accordingly,
they are
more
useful
in
such
applications as
broadcast
production
or
cassette duplication.
The
RELEASE
TIME
control
is
calibrated
with an
arbitrary scale
because
the
release
time
is
automatically
varied
according
to
the nature
of
the
program
material. This
minimizes
audible
compression-induced
side-effects.
(The
RELease
SHAPE
switch
determines
if
the release
proceeds
at a
constant
number
of
dB
per
second
(LINear), or
if
it
starts
more
slowly
and then speeds
up
as
it
progresses
(EXPonential).
LINear
usually
sounds
most
natural,
but
EXPonential can be
useful
if
you
want
to
create the "open" sound associated
with slow release
times, yet gain-ride quickly during
pauses
or low-level
program
material. Like the other
controls,
it
should
be
adjusted "by ear"
to
your
taste.)
5)
It
is
important
to
note
that the
OUTPUT
TRIM
control
should not
be
treated
like
a
familiar
"output
attenuator"
control:
It
is
ordinarily
left
at
"0".
Its
purpose
is
to
permit you
to
operate the Voltage-Controlled Amplifier
(VCA)
in
the
optimum
part of
its
range
for
your
application.
You
can
use the
OUTPUT
TRIM
control
to
create
controlled clipping
in
the
VCA,
to
prevent
VCA
clipping,
or
to
optimize
the signal-to-noise
ratio.
Refer
to
the
OF*ERATING
MANUAL
for
further
details.)
A
standard
OUTPUT
ATTENuator
control
is
located
on
the
rear
panel.
Compressor/Limiter Enhancements: The IDLE
GAIN
control
determines the
gain of
the
Compressor/Limiter
when
the
COMP/LIM OPERATE/DEFEAT
switch
is
in
DEFEAT.
If
the
IDLE
GAIN
control
is
set
close
to
the
average
amount
of
gain
reduction,
the
Compressor/Limiter can be defeated and
reactivated
in
the
middle
of
program
material without obvious side-effects such as
sudden
gain changes.
(The
control
also
has a second function
which
will
be
explained below.)
2
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