Alesis QS6 Reference Manual page 110

Editing Effects: Chapter 7
Reverse. The Reverse Reverb type is an inverted reverb in which the volume
envelope is reversed. This means that the signal begins softly but grows louder until it
is cut off, rather than loud to soft as normal.
Pre-Delay Time (0 to 299ms) Pages 6 & 7
Pre-Delay is the slight delaying of the Reverb itself so that the dry signal more easily
stands out from the Reverb. A bit of Pre-Delay can sometimes make certain
instruments (such as snare drums) sound bigger. Use page 6 to adjust the Pre-Delay
Time in 10ms intervals, and/or use page 7 to adjust the Pre-Delay Time in 1ms
intervals. This Pre-Delay is part of the Reverb itself; don't confuse it with the separate
Delay modules available under the Delay function.
Pre-Delay Mix (<99 to <0> to 99>) Page 8
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) Page 9
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) Page 10
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) Pages 11 & 12
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.
QS6 Reference Manual 109