The invention discloses an audio signal editing apparatus and a control method therefor. Interlocking flag, indicating whether or not an interlocked display should be made, can be set in association with predetermined editing operators. When any of the operators is operated, a displayed screen on a display is switched over to a screen related to the operated operator, if the interlocking flag associated with the operated operator indicates flag-ON; if not, the display device may be used to perform another function. A plurality n of channels may be divided into a plurality of layers each consisting of predetermined number m channels. It is only necessary that a limited number of operators, e.g. faders, be provided to correspond to a single layer, i.e. m channels. Any of the layers is selected, and any of the operators is used for the selected layer. A set of stereo channels can be set across different layers so as to interlock with each other in response to editing operation of the operator.