Patent ID: 9712268
Date: 2017-07-18
CPC Classifications: G06F,H04H

Claim:
1. A level control apparatus comprising: a channel level controller provided for each channel with a control part for displaying an output level of a corresponding channel by a position of the control part; a group level controller provided with a control part for displaying a group level of a group constituted of a plurality of the channels by a position of the control part; and a calculator for calculating difference among the output levels of the plurality of channels belonging to the group, wherein the group level controller selects a largest output level among output levels of the plurality of the channels belonging to the group as the group level, the channel level controller controls, according to an operation of the control part of the channel level controller, the output level of the channel corresponding to the channel level controller, and the group level controller collectively controls, according to an operation of the control part of the group level controller, output levels of the plurality of the channels belonging to the group with the difference of the output levels among the channels calculated by the calculator being maintained.