The coneOuterGain property of the PannerNode interface is a double value, describing the amount of volume reduction outside the cone, defined by the coneOuterAngle attribute.

The coneOuterGain property's default value is 0, meaning that no sound can be heard outside the cone.

A double. The default is 0, and its value can be in the range 0–1.

InvalidStateError DOMException

Thrown if the property has been given a value outside the accepted range (0–1).

See PannerNode.orientationX for example code that demonstrates how changing the PannerNode orientation parameters in combination with coneInnerAngle and coneOuterAngle affects volume.

• Using the Web Audio API
• Web Audio spatialization basics