Polycom SoundStructure C16 Design Manual page 138

All the Edit Crosspoint controls allow the user to adjust the crosspoint gain in dB by adjusting the slider or
by clicking in the value cell and typing in a gain adjustment directly.
Edit Crosspoint User Controls
Muting the Matrix Crosspoint
The matrix crosspoint is muted by clicking the Mute button. Muted crosspoints are shown in the matrix as
grayed out values if the Hide Muted Matrix Crosspoints option is not enabled in the Options... selection
under the Tools menu. Otherwise if the Hide Muted Matrix Crosspoints is enabled, the muted crosspoints
are blank.
Inverting the Matrix Crosspoint
The matrix crosspoint may be inverted meaning that the signal is adjusted by the matrix crosspoint value
and negated. The invert feature is there to allow matrix "subtraction" in addition to the more common
summing of signals to create output signals.
Using the Input Processing Path
When input channels are used in the matrix, there are three possible versions of the input that may be used
at the crosspoint: the ungated/recording version, the conferencing version (on C-series or noise canceled
on SR-series), and the sound reinforcement version. If the ungated/recording version is selected, the
channels page Ungated Type control selects which version of the ungated channel is used.
The selection of which type of input processing to use in the matrix is performed with the matrix crosspoint
control as described in the next section.
To select the sound reinforcement version of the input processing, double click the matrix crosspoint to
adjust and select Gated and Snd Reinforcement. The crosspoint cell shading changes to light blue to
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