Lexicon LEXICON480LV4 Owner's Manual page 43

Lexicon 480L Owner's Manual
Page Two
BASS MULTIPLY
BASS MULTIPLY sets the reverb time for low-fre-
quency signals, as a multiplier of the RT MID parame-
ter. For example, if BASS MULTIPLY is set to 2X, and
RT MID is set to two seconds, the low frequency reverb
time will be four seconds. For a natural-sounding hall
ambience, we recommend values of 1.5X or less.
CROSSOVER
CROSSOVER sets the frequency at which the transi-
tion from LF RT to RT MID takes place. CROSSOVER
should be set at least two octaves higher than the low
frequency you want to boost. For example, to boost a
signal at 100 Hz, set the CROSSOVER to 400 Hz (This
setting works well for classical music). CROSSOVER
works best around 500 for boosting low frequencies,
and around 1.5 kHz for cutting low frequencies.
RT HF CUT
RT HF CUT sets the frequency above which sounds
decay at a progressively faster rate. It filters all the
sound except the preechoes. When set relatively low,
it gives a darker tone to the reverberation, simulating
the effect of air absorption in a real hall. This also helps
keep the ambience generated by the program from
muddying the direct sound.
DIFFUSION
DIFFUSION controls the degree to which initial echo
density increases over time. High settings of DIFFU-
SION result in high initial buildup of echo density, and
low settings cause low initial buildup. After the initial
period (in which echo buildup is controlled by DIFFU-
SION) density continues to change at a rate deter-
mined by SIZE. To enhance percussion, use high
settings of diffusion. For clearer and more natural
vocals, mixes, and piano music, use low or moderate
settings of diffusion. The plate presets and some of the
room presets use an algorithm with higher inherent
diffusion. If high diffusion is desired, start with one of
these presets. They are easily identifiable because
they have only two preechoes.
3-6
DECAY OPT (Decay Optimization)
DECAY OPT alters program characteristics in re-
sponse to changes in input level, to make reverberation
decay sound more natural. DECAY OPT should nor-
mally be set to REVERB 7.
To make it easy to create "wild spaces" DECAY OPT
has a second mode--EFFECTS. In the EFFECTS
mode, the numbers 0 - 9 have the same effect as they
do in the REVERB mode. However, in the EFFECTS
mode the SPREAD control is not linked to the SIZE
control, making it possible to use high values of
SPREAD with low values of SIZE. These settings can
result in some interesting, but unnatural sounds.
Note: On certain types of program material (such as
soft low-frequency tones from a synthesizer) side
effects may be audible during level changes. If these
are heard, set DECAY OPT to REVERB 0 or EF-
FECTS 0.
WET/DRY MIX
WET/DRY MIX controls the ratio of direct vs. effect
signal in the output from a program. When the 480L is
patched into a console, this control should almost
always be set to 100% wet. When an instrument is
plugged directly into a 480L, or when the Cascade
configuration is in use, a setting between 45 and 60%
is a good starting point for experimentation with this
parameter.
WET/DRY MIX is a sine/cosine fade. Practically
speaking, this means that MIX can be adjusted over its
range with little or no change in output level. When you
control mix at the console, adding effect to the dry
signal increases overall level.