Section 4 - Algorithms
KEYED EXPANDER
00
-
Keyed
Expander
operation is identical to the Expander. The only difference is
that
the
left
signal
(Input
1)
is
expanded
as
determined
by
the
key.
The key is the right channel signal (Input 2).
Keyed Expander Signal Routing
118
Left
Right
01-
Mix
02-Volume
Expander
Filtering
(side chain)
Side Trim
Keyed
Expander
Output
Mixer
Main
Output
See the descriptions
under
the Mix
and
Volume Parameters, in the beginning of this section. The
Mixer
works
as
in
all the other algorithms,
and
is distinct from the
output
mixer
shown
in
the
diagram above.
03 - Exp Ratio Range:
1:1
to 1 :40, infinity
Sets the
amount
of
expansion. The
range
is
based
on
decibels
(dB)
below
the
threshold.
If
this is
set to
1:4
for example, it will
expand
changes
in
signals below the threshold
by
a factor
of
four
.
When
this is
set
to
infinity, it acts as a gate. A setting of
1:1
offers
no
expansion.
04 - Exp Threshold
Range: -96 to +00 dB
This
parameter
sets the threshold level. Signals that exceed this level will
be
unaffected,
while
signals
that
are
below
will be
expanded
. To
tum
off the expander, set the level to -96 dB.
05 - Gain Change
Range:
NlA
This
read
only
parameter
displays
the
amout
of gain reduction
in
real time.
06 - Exp Attack Range:
50~s
to 100ms
This
parameter
determines the attack rate after the initial signal has
been
detected
and
before the
expansion takes affect.
07 - Exp Release
Range: 1ms to 10.0s
This
parameter
determines the release rate after the signal has been detected below the
threshold
level. This is generally chosen
longer
than
the attack time (parameter
06).
08 - Expander Gate Hold Time
Range: 1 ms to 10.0s
This
parameter
is the detection
sustain
time
in
the ADSR which constitutes attack, sustain,
and
release.
ENSONIQ DP/4 Musician's Manual
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