Specifications
bright reverb reflections decay sooner than the bass
reflections. In the 9120, this effect can
be
controlled by a
parameter called high damping (HDmp), which rolls off
high frequencies
as
the signal decays.
Hi
damping can
be
used effectively on a total mix, letting you selectively
apply reverb to the low and mid range sounds of the mix,
while keeping the high frequencies (cymbals, for
example) relatively
dry-
creating a naturally reverberant,
yet clear and uncluttered sound.
Often, many sound waves first reach a surface- for
example, a flat back wall-at the same time, and reflect a
large part of the sound spectrum uniformly. The sound of
this
noticeable echo
(and,
depending on the shape of the
enclosed space, there may be more than one of them) is
called
an
early reflection. These reflections often tell our
ears a lot about the physical environment. The 'Hall' and
'Room'
reverb effects in the 9120 provide controls for the
delay time (Reff) and strength (RefL) of early reflections.
Density is a measure of sound waves per unit of space.
Small spaces tend to build and lose reverb density fast,
whereas larger ones, like concert halls, gather and diffuse
density more slowly.
ZOOM
DSP engineers have
designed reverb algorithms accordingly, so that even
before you program any parameters, the basic shape of a
'hall' or 'room' reverb is natural to those simulations.
In
the 9120 'halls', density is also a user-controlled parameter
(Dens), which allows you to specify the basic density
level of the
reverb (even though that changes dynamically
within the algorithm).
A
low density setting makes the
reverb sound lighter, more airy, as in the case of
a
building with
a
very high ceiling. In 9120 'rooms', you
can
also change the basic shape of the reverb algorithm by
applying the attack parameter (Atck). This parameter
emphasizes the reverb right from the beginning of the
effect, thus
(if
there is no pre-delay), enhancing the source
material.
Direct
Level
Delay
Ambient effects
using
'E/R1
The 9120 also has an algorithm
@/R)
designed to create
an
early reflection without much reverb decay, such
as
a
natural echo against
a
wall outside or a building. In this
case, use pre-delay (PDly) to indicate the distance to the
wall,
and
tap
angle (Angl) to control the direction and
length of the effect decay. However, the
E/R
effect is
especially useful in creating realistic room environments
which have no obvious reverb 'tails', but indicate ambient
space. Use the size parameter for room size and control
the tonal character with the low and high equalizers
(LoEQ, HiEQ). The HiEQ will simulate damping. Try
building a rehearsal room simulation with the
E/R
for
your drum machine samples.
Revert, effects using 'Plate'
and 'Gate1
Reverb was first imitated electronically with the use of
metallic springs and plates. Spring reverb was the most
affordable, but was limited by the density of reflections it
could produce
as
well
as
an
uneven resonant response.
Large plates, with far greater physical mass, achieved by
great density and smooth decay of natural ambient
reflections. Though expensive and cumbersome, plate
technology provided the first 'real' acoustic
reverb
simulations, though they lacked precise control of early
reflection effects. Beyond modeling acoustic
environments, the smooth, bright quality of plate
reverberation has become a staple in multi-track
recording, used
to
enhance many different sounds, from
drum tracks to vocals. The 9120 includes plate reverb
algorithms to emulate this effect. Except for early
reflection values, most of the parameters
are
the same as
those which control the 'halls' and 'rooms' which the
addition of a low pass filter parameter called Tone. This
parameter allows you
to
establish a cutoff frequency over
which the reverb will not respond. The range from 0
-
15
establishes
an
overall tonal quality from dark to bright.
Another popular reverb effect is gated reverb. This
technique shapes the reverb dramatically by sending it
through a noise gate. The noise gate is like a volume
envelope
in
a synthesizer
-
it can open and close down
the signal on command. The sound of a snare drum with
lots of
reverb which stops abruptly is a well known
example. The 9120 shapes the signal with Hold
and
Decay parameters and allows the gate
to
be
triggered
with the sensitivity control (SENS).
Gate
Reverb
.
Time
Section
111
:
Effects and and Their Parameters