Alesis QSR 64 Reference Manual page 112

Pre-Delay Mix (<99 to <0> to 99>)
This allows you to mix the amount of Pre-Delay into the Reverb signal path. This
gives you the ability to hear a bit of the Reverb before the loudest part of the Reverb
(the Pre-Delayed Reverb) sounds. This makes for bigger and smoother sounding
Reverb settings.
Input Filter (00 to 99)
This adjusts the frequency of the low-pass filter which comes before the Reverb
input. Lower the Input Filter value to remove high frequencies from the input signal
before they go into the Reverb.
Decay (00 to 99)
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.
Low Decay and High Decay (00 to -99)
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. If the selected Reverb type is Gate, the Low Decay parameter is
unavailable.
Density (00 to 99)
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 "fade-in" and then "fade-out". 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; the reverb sounds more "dense".
If the select Reverb type is Large, the Density parameter is unavailable.
Diffusion (00 to 99)
Diffusion determines the "thickness" of the reverb sound by adding more reflections
to the reverb's 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 reverb's
decay. Greater diffusion works better with percussive sounds, whereas less amounts
of diffusion work well with vocals and other sustained sounds.
Note: The illustration above reflects a Density setting of 0.
QSR Reference Manual
Page 13 (Page 12 if Gated or Reverse type)
Page 14 (Page 13 if Gated or Reverse type)
DIFFUSION OF 0
L
E
V
E
L
TIME
Fewer reflections
Editing Effects: Chapter 7
DIFFUSION OF 99
L
E
V
E
L
TIME
More reflections
Page 8
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Page 10
Pages 11 & 12
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