Polycom C16 - Manual (Page 340)

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
12 - 2
Adjusting Matrix Crosspoints
Individual crosspoints can be adjusted by double clicking the crosspoint. This
will bring up the matrix control that allows the crosspoint gain, mute status,
or which of the three flavors of the input signal to select for this matrix
crosspoint.
Multiple crosspoints may be selected in a contiguous area by left clicking on
the first cell and dragging across to the bottom cell as shown in the following
figure. Once the area is selected, hold down the Control key and double click
in any of the cells to bring up the matrix crosspoint control. Any changes made
to the control will affect all selected crosspoints.
In addition, an arbitrary collection of crosspoints can be selected by clicking on
the first crosspoint and then holding the Control key as other crosspoints are
selected. Once the collection of crosspoints has been selected, hold down the
Control key and double click any of the cells to bring up the matrix crosspoint
control. Any changes made to the matrix control will affect all selected
crosspoints.