Lexicon PCM NATIVE - Random Hall Algorithm; Random Hall Algorithm Description

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Random Hall
The highly acclaimed Lexicon
®
Hall, Concert Hall, and Random Hall reverb algo-
rithms have regularly been used by live sound and recording engineers because
of their exceptional ability to reproduce the musical ambience of large, wide,
panoramically wonderful spaces.
Random Hall is similar to Hall, with gradual build-up, well suited to complex
sounds like orchestral music. Its reverberators change over time in controlled
random ways to avoid the buildup of tinny, grainy, metallic, or other colorations.
The modulation can be noticeable and is often a desirable effect. This is one of
the classic Lexicon
®
sounds.
The early reections are user adjustable in amplitude and delay. Some skill is
needed to set useful reection patterns. The pattern can be expanded or con-
tracted in time using the “Delay Master” control, and the overall level of the pat-
tern can be set with the “Early Level” control.
A hall is the principal venue for classical ensembles, but has proven to be useful
for all types of music. A hall is comparatively large, with wall-to-wall distances
that are typically several tens of meters. Smaller halls may be used for smaller
ensembles. The characteristic sound of a hall includes very low initial reection
density, with little reection energy before 60-100 milliseconds. Density buildup is
more gradual, because of the larger distances between reecting surfaces. Re-
verberation time is somewhat longer as well. Finally, in most halls lower frequen-
cies reverberate longer than higher frequencies.
One of its charms is a bit of irregularity in the decay. In some cases (very small
rooms with precisely-pitched instruments), this modulation may not be the best
choice. But in general, this is a time-tested reverberator.