US Patent 7532731 Digital mixer apparatus and method therefor

In a digital mixer, one of channels assigned to channel strips is selected, via a select switch, from among a plurality of channels allocated to a layer selected via a layer selection switch. The selected channel is retained in a history table. Each time a history readout switch is depressed, a channel history is read out from the history table. The thus read-out channel is set as an editing channel. In a layer-linking mode, the layer to which the read-out channel is allocated is selected, and the channels contained in the layer are assigned to the channel strips.