Patent ID: 7694230

Claim:
A digital mixer comprising: a storage section that stores therein operational data including a plurality of parameters; a signal processing section that performs mixing processing of an algorism on the basis of the operational data, the algorism comprising input channels for inputting and controlling audio signals and mixing buses for mixing the controlled audio signals selectively supplied from the input channels; a display; a background screen selection section that, in response to a first selection operation performed by a user, selects one of background screens and displays the selected background screen on said display, each of the background screen showing general parameters of a group of input channels among the input channels stored in said storage section; a detailed setting window display section that, in response to a second selection operation performed by the user, selects one of detailed setting windows and displays the selected detailed setting window in front of the background screen currently displayed on said display, each of the detailed setting windows showing detailed parameters of one or more of the input channels stored in said storage section; a parameter control section that, in response to a value change operation performed by the user on a given parameter shown on the detailed setting window or the background screen currently displayed at a frontmost layer on the display, changes a value of the parameter in said storage section; a bookmark registration section that, in response to a registration operation performed by the user when any one of the detailed setting windows is currently displayed on said display, stores, into said storage section, designation data indicative of the one detailed setting window, wherein, in response to registration operation performed by the user when no detailed setting window is currently displayed on said display, said bookmark registration section stores, into said storage section, designation data indicative of the background screen currently displayed on said display and not indicative of any detailed setting window; and a bookmark call section that, in response to a call operation performed by the user, determines whether or not the designation data stored in said storage section is indicative of any detailed setting window, and when the determination is affirmative, displays the detailed setting window indicated by the designation data in a frontmost layer of the background screen currently displayed on said display, and when the determination is negative, displays the background screen indicated by the designation data on said display.