3-31
Algorithms and Parameters
PCM 81
Def
Available in the Concert Hall and Glide>Hall algorithms, Definition
affects the echo density buildup rate during the latter part of the
decay period. At 0, the rate is determined by the program
material. Raising Definition causes the sound to become choppier
— the decrease in density of the echoes creates increasingly
distinct, repetitive echo trails.
Depth
Available in the Concert Hall and Glide>Hall algorithms, this
control sets the output amplitude envelope, changing the listener's
perspective from the front to the rear of the hall.
Spin
Spin affects the movement of the reverb tail. The object of Spin is
to continuously alter the timbre of the reverb sound. This makes
the result more natural, without making the position of instruments
unstable. Spin should typically be set to values between 10 and 50.
Higher values may make the timbre of piano or guitar unstable.
Chorus
In the Concert Hall and the Glide>Hall algorithms Chorus
randomizes delay times and introduces modulation to make reverb
sound less metallic. Increasing Chorus increases the modulation rate.
Because Chorusing can cause pitch variation, this parameter should
be set with care when using sources with very little pitch wobble
(such as guitar or piano). A good practice is to increase the setting
until pitch wobble becomes noticeable, then lower it slightly.
Link
This control is available in all algorithms except Inverse. When Link
is set to On, the reverb time (Mid Rt) and Spread scale linearly as
the Size control is varied. For some special effects, Mid Rt, Spread
and Size can be unlinked.
Rvb Width
In all of the 4-Voice algorithms, this control performs the same
function as FX Width, but controls the audio of only the reverb and
post delay reverb.
Rvb In/Out
Rvb In and Rvb Out control the level of the audio going into and
coming out of the reverb effect. Rvb In has a range of Full (0dB)
down to -85dB, and Off. Rvb Out has a range of Full (0dB) down
to -24dB, and Off. Rvb Out does not affect the level of the
pre-echoes set by the Ref Lvl and Eko Fbk parameters.
RVB TIME
The Reverb Time row, available in every algorithm, contains
parameters that affect the time-based aspects of the reverb effect.
Mid Rt and Low Rt
Mid Rt sets the reverb time for mid-frequency signals. Because low
frequency reverb time (Low Rt) is a multiplier of Mid Rt, Mid Rt acts
as a master control for the reverb time.
Low Rt sets the reverb time for low-frequency signals, as a
multiplier of the Mid Rt parameter. For example, if Low Rt is set to
2X, and Mid Rt 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.
. . . continued on page 3-32
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