Audio mixer

An audio mixer comprising:

• a plurality of input channels to which one or more audio signals supplied from input sources are inputted, each of said input channels inputting thereto one audio signal at a time;
• a surround bus group constituted by a given number of buses corresponding to a necessary number of channels for achieving a predetermined surround effect;
• a channel grouping section which groups, as a surround channel group, a given number of input channels, included among said plurality of input channels, corresponding in number to the given number of buses constituting the surround bus group, and which sets, as a parameter-ganging channel, at least one of the input channels belonging to the surround channel group;
• a connection section which connects each of the input channels, belonging to the surround channel group, to a corresponding one of the buses belonging to the surround channel group;
• an instruction reception section which receives a change instruction for changing a value of a parameter for one of the input channels belonging to the surround channel group;
• a determination section which determines whether or not the input channel, for which the change instruction has been received, is the non-parameter-ganging channel;
• and
• a parameter control section which, when said determination section has determined that said input channel, for which the change instruction has been received, is not a non-parameter-ganging channel, controls, on the basis of the change instruction, values of the parameter in all input channels of the surround channel group that are not non-parameter-ganging channels, and which, when said determination section has determined that said input channel, for which the change instruction has been received, is a non-parameter-ganging channel, controls, on the basis of the change instruction, a value of the parameter only in said input channel for which the change instruction has been received.