Pre-Delay; Pre-Delay Mix; Density; Diffusion - Alesis Wedge Reference Manual

The "BassF" parameter selects the highest frequency which will be boosted, and the
"Boost" parameter sets the amount of boost, up to 6 dB.

Pre-delay

All the reverb effects have pre-delay parameters. Pre-delay slightly delays the reverb
itself up to 500 ms, so that the dry signal more easily stands out from the reverb. A
bit of pre-delay can make certain instruments (such as snare drums) sound bigger. It
is also useful when simulating big spaces, where the echos may take a moment to
build up. You can also use predelay in conjunction with early reflections to dictate
various room shapes.

Pre-delay Mix

This allows you to balance the amount of Pre-delay to Direct Signal as a percentage
of each. This gives you the ability to hear a bit of the Reverb before the Pre-Delayed
Reverb sounds, making the delay less apparent.

Density

Density controls how smooth the reverb decay and early reflections sound. When set
for very low values, the decay is "bumpier" and simulates a large room with lots of
distinct echoes. If the density is set high, the reverb will be very smooth, like a
chamber or tiled room. Try using lower density settings on vocals, piano and other
sustained sounds, and higher density for percussive sounds.

Diffusion

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 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.
DIFFUSION OF 0
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Note: The illustration above reflects a Density setting of 0.
Wedge Reference Manual
TIME
Fewer reflections
Overview of Effects – Chapter 5
DIFFUSION OF 99
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TIME
More reflections
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