An audio mixing system comprising: a plurality of input ports adapted to receive input sound signals; a plurality of input channels (32-1 to 32-N) adapted to receive input sound signals from the plurality of input ports, wherein the plurality of input channels (32-1 to 32-N) are defined by channel numbers that increase sequentially; input patch means adapted for selectively patching the plurality of input ports to the plurality of input channels (32-1 to 32-N); a mix bus adapted for mixing sound signals supplied from the plurality of input channels (32-1 to 32-N); a plurality of output channels (35-1 to 35-M) adapted for inputting sound signal mixed by the mix bus, wherein the plurality of output channels (35-1 to 35-M) are defined by channel numbers that increase sequentially; a plurality of output ports adapted to output sound signals; and output patch means adapted for selectively patching the plurality of output ports to the plurality of output channels (35-1 to 35-M); wherein the audio mixing system further comprises port registration means adapted for registering two or more input ports included in the plurality of input ports or two or more output ports included in the plurality of output ports as a plurality of patch ports, characterized in that the input patch means or the output patch means is provided with group patch means adapted for collectively patching the plurality of patch ports, which have been registered by the port registration means, as a port group to two or more channels included in the plurality of input channels (32-1 to 32-N) or two or more channels included in the plurality of output channels (35-1 to 35-M), respectively, and the group patch means has top channel designation means adapted for designating a top channel of the two or more channels to which the plurality of patch ports are to be patched, and sequentially patches the plurality of patch ports to the two or more channels included in the plurality of input channels (32-1 to 32-N) or to the two or more channels included in the plurality of output channels (35-1 to 35-M), respectively, in accordance with channel numbers, starting at the designated top channel, wherein the top channel is a channel to which a top patch port of the plurality of patch ports registered by the port registration means is patched, wherein the plurality of patch ports, which are registered by the port registration means, are sequentially assigned to the plurality of input channels (32-1 to 32-N) or output channels (35-1 to 35-M), wherein the ports of the port group are patched to the same number of input channels (32-1 to 32-N) or output channels (35-1 to 35-M) as the number of ports of the port group, starting at the top channel. a plurality of input ports adapted to receive input sound signals; a plurality of input channels (32-1 to 32-N) adapted to receive input sound signals from the plurality of input ports, wherein the plurality of input channels (32-1 to 32-N) are defined by channel numbers that increase sequentially; input patch means adapted for selectively patching the plurality of input ports to the plurality of input channels (32-1 to 32-N); a mix bus adapted for mixing sound signals supplied from the plurality of input channels (32-1 to 32-N); a plurality of output channels (35-1 to 35-M) adapted for inputting sound signal mixed by the mix bus, wherein the plurality of output channels (35-1 to 35-M) are defined by channel numbers that increase sequentially; a plurality of output ports adapted to output sound signals; and output patch means adapted for selectively patching the plurality of output ports to the plurality of output channels (35-1 to 35-M); wherein the audio mixing system further comprises port registration means adapted for registering two or more input ports included in the plurality of input ports or two or more output ports included in the plurality of output ports as a plurality of patch ports, characterized in that the input patch means or the output patch means is provided with group patch means adapted for collectively patching the plurality of patch ports, which have been registered by the port registration means, as a port group to two or more channels included in the plurality of input channels (32-1 to 32-N) or two or more channels included in the plurality of output channels (35-1 to 35-M), respectively, and the group patch means has top channel designation means adapted for designating a top channel of the two or more channels to which the plurality of patch ports are to be patched, and sequentially patches the plurality of patch ports to the two or more channels included in the plurality of input channels (32-1 to 32-N) or to the two or more channels included in the plurality of output channels (35-1 to 35-M), respectively, in accordance with channel numbers, starting at the designated top channel,