Patent ID: 7532731

Claim:
A digital mixer apparatus which includes signal processing sections corresponding to N channels, each of which is specified by a channel number, and mixes output signals from individual ones of the signal processing sections and in which the N channels are grouped to define a plurality of layers each having a different group of one or more channels allocated thereto and a maximum number of the channels that can be allocated to each one of the layers being a predetermined number M which is smaller than N, said digital mixer apparatus comprising: a layer selection section that selects any one of the plurality of layers; M channel operation sections each including at least a selecting control and a level control, the channels allocated to the one layer selected by said layer selection section being assigned respectively to said channel operation sections; a level control section that, in response to an operation of the level control in any one of said channel operation sections, controls a signal level in the signal processing section of the channel assigned to the one channel operation section; a channel selection section that, in response to an operation of the selecting control in any one of said channel operation sections, selects, as an edit channel, the channel assigned to the one channel operation section; a channel history retaining section that retains a history of the channel numbers of the channels selected as the edit channel by said channel selection section in sequence; a history readout section that, in response to a predetermined history readout instruction, reads out one of the channel numbers in the history retained by said channel history retaining section and selects a channel specified by the channel number, as the edit channel; an editing channel display section that displays the channel number of the channel most recently selected as the edit channel by said channel selection section or said history readout section; and a selected channel control section that, in response to an editing operation, controls a signal processing characteristic in the signal processing section of the channel most recently selected as the edit channel by said channel selection section or said history readout section.