ALESIS QS8.1 - Manual (Page 106)

Part 6: Editing Effects
100 QS7.1/QS8.1 Reference Manual
DECAY
Range of Settings: 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/ HIGH DECAY
Range of Settings: 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. With these parameters you can simulate different surfaces of a room or hall,
with softer surfaces absorbing more high frequencies and smaller rooms having
faster low frequency decay.
Note: If the selected Reverb type is Gate or Reverse, the Low Decay parameter is
unavailable (leaving only 13 pages of Reverb parameters available [10 in Config #2]).
DENSITY
Range of Settings: 00 to 99 Page 13 (Page 12 if Gated or Reverse type)
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”.
Note: If the select Reverb type is Large, the Density parameter is unavailable (leaving
only 13 pages of Reverb parameters available [10 in Config #2]).
DIFFUSION
Range of Settings: 00 to 99 Page 14 (Page 13 if Gated or Reverse type)
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.