Polycom SoundStructure C16 Design Manual page 135

Each group of virtual channels has a heading associated with it - the virtual channel group name - that allows
the group to be collapsed or expanded.
.Matrix Page in SoundStructure Studio
The virtual channel groups may also be collapsed to create a matrix that looks like the one in the following
figure. The collapsed group crosspoints shows the underlying values of the individual crosspoints if all the
values are the same. For crosspoints whose value differs for members in the group, a shaded boundary is
shown. This can be seen in the matrix crosspoint of the Codec In group to the Phone Out virtual channel.
Polycom, Inc. 135