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Co-Operator
OPERATION
3-3
RELEASE
TIME
controls speed
or
slow
the program-controlled release time
to
match
the
processing
to
the type
of
audio being processed.
The
scale
is
arbitrary
because
the release time
is
automatically varied
according
to
the nature
of
the
program
material
(to
minimize
audible
compression-induced
side
effects).
RELease
SHAPE
buttons
select
a
constant
dB/second
release
rate
when
set
to
hard.
When
set
to
soft, the release
rate
slows as
gain reduction
decreases.
The
hard
setting,
which
results
in
uniformity
and
loudness,
is
intended
for
use
with single
tracks
and
live
voice; the
soft
setting rides
gain
more
subtly,
and works
well with
mixed program
material.
LEVELing
buttons
enable
or disable the
Co-Operator's slow
attack time
(about
200ms)
average-leveling
function. Relatively well-controlled material
(most
commer-
cial
recordings,
for
example)
will
sound most
natural
if
processed by
the
leveling
function
only,
with the
compressor
defeated.
COMPRessor
buttons
enable
or
defeat
the
compression
function,
which
provides
better fast transient
overshoot
protection
than the
leveling
function
can.
Because
the threshold
of
compression
is
substantially
higher than the threshold
of leveling,
compression
is
only activated
by those
transients that are too
fast for
the
slower
attack time
of
the
leveling
circuitry.
Program
material that
has an
unusually
high
peak-to-average
ratio
or
is
characterized
by
many
abrupt
level
increases
may
require
both
compression and
leveling.
HF
LIMITing buttons
enable
or
defeat
the
high-frequency
limiting
and
optional
clipping functions.
(The
clipping function
can be enabled by
repositioning
an
internal
jumper.
If
a
pre-emphasized
output
is
desired,
these buttons
must be
set
to
operate
and jumpers
B
and
C
on
the
main
circuit
board
must be
correctly positioned.
See
step
2 on
page
2-2
for
information
about
the
jumpers.)
SYSTEM
buttons
hardwire-connect
the
input of the
system
directly to
the output
terminals
when
set
to
bypass.
POWER
button
turns the
unit
on and
off.
MODE
button
causes
the
two audio channels
to
function
independently
when
set
to
dual.
When
set
to
stereo,
both
channels
receive
identical
gain reduction
to
better
preserve stereo imaging.
In
stereo mode,
the
amount
of
gain reduction
is
deter-
mined
by
the
channel
that
requires the
most
gain reduction
at
any
given
instant.
(The
high-frequency
limiters
always
operate independently, since
their
short release times
preclude stereo imaging problems.
Their operation
is
unaffected
by
the
mode
button.)
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