The GainNode() constructor of the Web Audio API creates a new GainNode object which is an AudioNode that represents a change in volume.

context

A reference to a BaseAudioContext, e.g. an AudioContext.

options Optional

Options are as follows:

gain

The amount of gain to apply. This parameter is a- rate and it's nominal range is (-∞,+∞). The default is 1.

channelCount

Represents an integer used to determine how many channels are used when up-mixing and down-mixing connections to any inputs to the node. (See AudioNode.channelCount for more information.) Its usage and precise definition depend on the value of channelCountMode.

channelCountMode

Represents an enumerated value describing the way channels must be matched between the node's inputs and outputs. (See AudioNode.channelCountMode for more information including default values.)

channelInterpretation

Represents an enumerated value describing the meaning of the channels. This interpretation will define how audio up-mixing and down-mixing will happen. The possible values are "speakers" or "discrete". (See AudioNode.channelCountMode for more information including default values.)

A new GainNode object instance.