This sub-panel is accessed by clicking the Setup button.
The preset list above the routing matrix gives quick access to a list of typical I/O routing profiles allowable given the current input and output counts.
The user is a presented with an N by M I/O routing matrix, where N is the number of input channels across, and M the number of output channels vertically. The current I/O assignment is displayed, an output assigned to an input being indicated by a blue matrix cell. Click on an unassigned cell to reassign the channels.