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Overview - Chapter 3
Q20 Reference Manual 51
Reverb Parameters
Most of the reverb effects in the Q20 operate under the same set of control
parameters, which are listed and described in this section. However, reverbs
which use more DSP provide parameters which take advantage of their extra
processing power; parameters which are not found in the other, smaller reverb
algorithms. For example, Reverberation Swirl is a parameter found in the Room 2
and Hall 2 types, but not in Plate 1. And the Nonlinear reverb type does not provide
gating options, since it is already a Ògated reverbÓ algorithm. Here are the reverb
parameters:
Decay
The Reverb Decay determines how long the Reverb will sound before it dies away.
When using the Reverse Reverb type, Reverb Decay controls the Reverse Time.
Damping – Hi & Lo
These two parameters allow the Decay Time to be set separately for both the low
and high frequencies of the Reverb. This means that you have control over the
tonal shape of the Reverb itself, being able to make the high frequencies die faster
if the effect is too bright, and being able to make the lows die faster if the effect is
too boomy. This allows you to simulate different surfaces of a room or hall, with
softer surfaces absorbing more high frequencies and smaller rooms having faster low
frequency decay.
Density
Density controls how the first reflection of the reverb effect will appear. When set
to 0, the first reflection is heard alone without any other reflections. When set to
99, the first reflection appears to Òfade-inÓ and then Òfade-outÓ. This is because a
number of reflections will occur just before and just after the first reflection, in
addition to the remaining reflections heard after the first reflection. Thus, the
reverb sounds more ÒdenseÓ.
Diffusion
Diffusion determines the ÒthicknessÓ of the reverb sound by adding more reflections
to the reverbÕs decay. With lower diffusion settings, you may be able to actually
hear the individual echoes that make up the overall reverb sound. With higher
diffusion settings, the echoes increase in number and blend together, washing out
the reverbÕs decay. Greater diffusion works better with percussive sounds, whereas
less amounts of diffusion work well with vocals and other sustained sounds.
TIME
L
E
V
E
L
L
E
V
E
L
TIME
Fewer reflections More reflections
DIFFUSION OF 0 DIFFUSION OF 99
Note: The illustration above reflects a Density setting of 0.