Lexicon PCM96 - Manual (Page 23)

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When dealing with true surround source material, the choice of configu-
ration is simple--choose the 4-in or 5-in version. The algorithms are all
designed to treat the inputs uniquely. If the algorithm is a reverberator or
room, then each input will propagate into the space from the direction of its
virtual source. If the algorithm is a delay or effect, each input will be treated
by itself, and then possibly propagated into shared feedback paths.
But when dealing with stereo source material (the more typical case), some
thought must be given to the choice of configuration. The 4-in or 5-in con-
figuration may still be used of course, and the source material will be more
obviously placed in the front of the virtual space. In the case of a delay or
effects algorithm, not all voices will be activated. When the 2-in/multi-out
configuration is chosen, the input signals are also propagated to the surround
inputs (post level, post pan). This will sound different. A reverb may sound
more full. It will still be surround of course, but will not maintain the same
frontward localization. Delay and effects algorithms will now have all voices
activated and may be considerably more complex. There may be a small dif-
ference in gain for the same presets in the 2-in or multi-in configuration.
There’s no right or wrong in this choice. It’s up to the user which of these
configurations to use. But it is important to know how the sound will
change based on this choice.
All the DSP configurations are described below.
SINGLe SteReo (MoNo IN)
A mono signal is split into a stereo signal.
SINGLe SteReo
The left and right inputs are sent through a single virtual
machine.
dUAL SteReo (MoNo IN)
The left signal travels through one virtual machine, and the
right signal travels through a separate second virtual machine.
dUAL SteReo
Two stereo signals are processed independently by two virtual
machines.