Pre Delay Range Low Range High
Adjust time delay 
between the source 
signal and the onset of 
reverberation.
This control is not intended to precisely mimic the time 
delays in natural spaces, as the build-up of reverberation 
is gradual, and the initial time gap is usually relatively 
short. For the most natural effect, the Pre Delay values 
should be set in the range of 10-25 milliseconds. 
However, if a mix is very busy or overly cluttered, 
increasing the Pre Delay time may help clarify it, and set 
each instrument apart from each other.
0mS 100 / 200mS
Reverb Time
Adjust the amount of 
time the reverb can be 
heard.
Higher settings increase reverberation times which are 
usually associated with larger acoustical environments, 
but can decrease intelligibility. Lower settings shorten 
reverb times and should be used when a smaller 
apparent space or a more subtle effect is desired.
Dependant 
on algorithm.
Dependant on 
algorithm.
Size
Build-up rate of diffusion 
after the initial period 
(which is controlled by 
Diffusion).
The Size control changes reverb sound from very 
large to very small. Generally, set this control to the 
approximate size of the acoustic space being created, 
before adjusting anything else. The size in meters is 
roughly equal to the longest dimension of the space. 
Audio is temporarily muted when Size is changed.
Dependant 
on algorithm.
Dependant on 
algorithm.
Diffusion
Initial echo density.
High settings of Diffusion result in high initial echo 
density, and low settings cause low initial density. In a 
real-world situation, irregular walls cause high diffusion, 
while large at walls cause low diffusion. For drums and 
percussion, try using higher Diffusion settings.
Dependant 
on algorithm.
Dependant on 
algorithm.
Shape
Adjust the 'contour' 
of the reverberation 
envelope.
With Shape all the way down, reverberation builds 
explosively, and decays quickly. As Shape is advanced, 
reverberation builds up more slowly and sustains for the 
time set by Spread. With Shape in the middle, the build-
up and sustain of the reverberation envelope emulates 
a large concert hall (assuming that Spread is at least 
halfway up, and that Size is 30 meters or larger).
Dependant 
on algorithm.
Dependant on 
algorithm.
Vi1000 USER MANUAL
17.2.1    17.2.1: FX > ALGORITHMS > REVERBS
  17.2.1: FX > ALGORITHMS > REVERBS
Reverb Parameters