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The PCM 90 Dual Reverb Card uses four reverb algorithms to produce six Dual
Mono, and four Cascade effects. Each of the algorithms and its associated
parameter matrix is presented in this section.
The parameters for the Dual Rvb algorithms are identical to those in the PCM
90 with the following additions and exceptions:
InRouting
The InRouting control for the Dual Rvb algorithms varies from the InRouting
control in the PCM 90 in that three controls are provided to determine reverb
routing: Mono Split, RevMono Split, and Stereo Split.
Mono Split separates the two reverb blocks, creating two independent mono in/
stereo out reverbs. Machine A receives input from the left channel, and Machine
B receives input from the right channel.
RevMono Split separates the two reverb blocks, like the Mono Split setting, but
reverses the inputs so that A corresponds to the right channel, and B corrresponds
to the left channel.
Stereo Split creates two stereo in, stereo out reverbs. The outputs from both A
and B are stereo.
In the cascade algorithms, the three routing selections are: Left Cascade, Right
Cascade, and Stereo Cascade. Left Cascade feeds the left input to the cascade,
and ignores audio input from the right channel. Similarly, Right Cascade feeds
only the right input to the cascade. Stereo feeds left and right inputs into the
corresponding inputs to the cascade.
The Inverse effect, which is new to the PCM 90 contains the following unique
parameters:
Duration
This parameter in the RvbDesign row determines the length of time, in millisec-
onds, which passes before the cutoff in Inverse effects.
Low Slope and Mid Slope
These parameters are found in the all of the Inverse Rvb Time rows. Low Slope
determines the shape of the reverb envelope for low frequencies. When set to
0, the level of low reverb remains unchanged over its Duration, then cuts off
abruptly (depending on the amount of diffusion in use). Setting Low Slope above
0 causes the level of low frequency reverb to rise smoothly from soft to loud until
the sound is cut off. The greater the slope, the softer the initial reverberation and
the more pronounced its rise. With negative values, the low frequency reverb
drops from its initial level to a quieter one before cutoff. The lower the slope, the
more pronounced the dropoff. Mid Slope is similar to Low Slope, but applies to
middle and high frequencies. The actual frequencies affected are determined by
Crossover.
The Algorithms and Their Parameters
The Algorithms and
Their Parameters
New Parameters
2
2-1
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