Each crosspoint gain connects an input to an output buss. The gains multiply the input signal, and all the signals in each buss are summed to form the output of the bus. The gains in this implementation are specified as linear multipliers, and range from -1.0 to 1.0, which allows you to invert signals as well as adjust their amplitudes. A crosspoint gain of 0.0 corresponds to muting the channel on that buss.