Patent ID: 8335325

Claim:
An audio signal processing apparatus, comprising: a plurality of input channels, each for inputting an audio signal; a mix bus that mixes the audio signals input from the plurality of input channels; a volume level controller that controls a volume level of each input channel; a path disconnector that connects or disconnects a path from each input channel to the mix bus; a signal selector that select an audio signal to be input to the mix bus for each input channel from either a post-signal going through the volume level controller or a pre-signal bypassing the volume level controller; a volume adjusting operator that groups at least a part of the plurality of input channels and collectively adjusts volume levels of the grouped input channels; a mute setting device that sets muting of a mute target for the grouped input channels; a mute target selector that selects the mute target for the grouped input channels by selecting either a first mode in which only the post-signal of each of the grouped input channels is selected as the mute target or a second mode in which both the pre-signal and post-signal of each of the grouped input channels are selected as the mute target; and a mute controller that, when the mute setting device has set muting of the mute target for the grouped input channels, controls the volume level controller to execute the muting of the mute target if the first mode is selected, or controls the path disconnector to execute the muting of the mute target if the second mode is selected.