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Æverb

Digital Reverb

ADM05

Control voltages present at the

jacks are added to the values set

with the knobs.

The useful range of voltage for the

CV jacks is ±5V.

The audio input signal goes in

here. The hardware will be

happiest if the signal level is

within ±7V.

The processed signal comes out here. It may

or may not bear much resemblance to the

input signal.

Assembled in USA from US and foreign components.

Revision 1.0

www.audiodamage.com

KnobsControl-Voltage Jacks

Audio Input Jack Audio Output Jack

Audio Damage Æverb is a digital reverb running a feedback

delay network algorithm (commonly called “FDN”). The

algorithm consists of eight short delays running through

eight low-pass filters, with the feedback paths summed in

to a single source that provides both the output

to the mix and the input to the delays themselves. This

type of reverb algorithm is generally considered

“vintage” sounding, and is useful in electronic music for

its thick, non-realistic behavior.

DECAY controls the overall gain of the

feedback loop of the delay network. More

gain results in longer decay times.

DAMP controls the corner frequency of the

filters on the individual delays, and works in

an inverse manner to a normal filter frequen-

cy control. At full anti-clockwise, the sound is

very dull, while at full clockwise, it is bright.

Note that we have allowed a full-on value,

even though this will result in a fairly noisy

signal due to the nature of FDN reverbs. (All

the noise in the single path gets amplified

and repeated ad nauseum.) The “sweet

spot” is at about 3 o’clock, resulting in a

signal that is bright but not too noisy.

The MIX knob controls, as the name implies,

the relative levels of the wet and dry signal.

At full anti-clockwise, the output is 100% dry,

and at full clockwise, it is 100% reverb.

Positive voltages at the DECAY jack

increase the decay time. Negative

voltages decrease it.

Positive voltages at the DAMPjack

decrease the damping and brighten

the reverb, while negative voltages

increase the damping and make the

reverb duller.

Positive voltages at the MIXjack

increase the reverb-to-dry signal

ratio, while negative voltages

decrease that ratio.

This reverb is not intended to be a studio-quality all-around

hall simulation; rather, it is a fun and musical addition to an

electronic musician’s toolset, with an eye to creating the

dense reverbs commonly used on Warp Records releases in

the mid 90s. (The name is a clue.)

The reverb algorithm doesn’t respond well to a driven

input; if you find the reverb to sound too distorted for your

liking, try attenuating the input signal a bit. Lower inputs

produce cleaner results.

Summary of content (1 pages)

PAGE 1
Digital Reverb Æverb Audio Damage Æverb is a digital reverb running a feedback delay network algorithm (commonly called “FDN”). The algorithm consists of eight short delays running through eight low-pass filters, with the feedback paths summed in to a single source that provides both the output Control-Voltage Jacks Control voltages present at the jacks are added to the values set with the knobs. Positive voltages at the DECAY jack increase the decay time. Negative voltages decrease it.