CANBERRA_FORCE_CHANNEL

A special attribute that can be used to control on which channel a sound is played.

The value should be one of mono, front-left, front-right, front-center, rear-left, rear-right, rear-center, lfe, front-left-of-center, front-right-of-center, side-left, side-right, top-center, top-front-left, top-front-right, top-front-center, top-rear-left, top-rear-right, top-rear-center. This attribute is only honoured by some backends, other backends may choose to ignore it completely.

If the list of attributes is handed on to the sound server this attribute is stripped from it.