03-Decay
Section 4 - Algorithms
Small
Room Range: 0.20 to 100.0 sec.
Large Room Range:
0.20 to 150.0 sec.
Hall
Range: 0.70 to 250.0 sec.
Controls the
amount
of time it takes for the reverberation to decay
away
to a
very
low
level after
the
input
signal stops. In the room reverbs
we
don't
recommend
higher
settings,
which
tend
to
create
an
infinite
and
unnatural sustain. Since
most
rooms
don't
naturally
have
a large decay, set
this
low
for the best sound. However, higher values are
recommended
for the hall reverb.
04 - Predelay Time
Range:
0 to 450 ms
Controls the
amount
of time it takes for the original signal
to
be
presented
to the reverb.
Higher
values denote a longer delay.
05 - LF DecayTime
Range:
-99 to +99
This
parameter
acts like a tone control and will boost (positive values)
or
cut
(negative values) the
rate
at
which
low frequencies will decay.
06 - HF Damping
Range
: 00 to
99
This
parameter
controls the rate of attenuation of
high
frequencies
in
the
decay of
the
reverberation. As natural reverb decays, some
high
frequencies
tend
to get absorbed
by
the
envirorunent. Increasing the value of this parameter will gradually filter
out
(dampen)
more
and
more
high
frequency energy.
07 - HF Bandwidth
Range
:
01
to 99
The
high
frequency
bandwidth
acts as a low
pass
filter
on
the signal
going
into
the
reverb,
controlling the
amount
of
high
frequencies that will
pass
into the effect. The
higher
the setting,
the
more
high frequencies are allowed to pass. This functions like a
tone
control
on
a guitar.
08 - Diffusion1
Range:
00 to 99
This parameter smears the
input
signal transients, to diffuse
and
smooth
the
sound
. Lower
values will cause impulse
sounds
to appear as a series of discrete echoes, while
higher
values
tend
to increase the smear (smoother sounding
with
fewer discrete echoes). We
recommend
settings of 50 for starters.
09 - Diffusion2
Range
: 00 to
99
This parameter, similar to
and
in
series with Room Diffusionl, performs
the
same
way
but
controls lower frequency ranges. Experiment
with
different levels
between
the diffuser
parameters
to find the settings that are right for
your
source.
10
- Decay Definition
Range:
00 to
99
Controls the rate
at
which echo density
is
increased
with
time. Setting this
parameter
too
high
can
cause
the
echo density to build at a rate which exceeds
the
decay rate. A general rule of
thumb: Definition should
not
exceed the
LF
Decay Time
added
to the Decay Time.
11
- Detune Rate
Range:
00 to
99
Controls the LFO rate of detUning introduced into
the
reverberation decay.
Detuning
creates a
slight oscillating pitch shift into the decay, giving it a
more
natural
sound
by
breaking
up
resonant modes.
ENSONIQ DP/4 Musician's Manual 59
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