Sets the priority of the AudioSource.
Unity virtualizes AudioSources when there are more AudioSources playing than available hardware channels.
The AudioSources with lowest priority (and audibility) are virtualized first.
Priority is an integer between 0 and 255. Where, 0 = high priority, 255 = low priority.
WebGL: This setting doesn't affect WebGL because there is no limit on the number of audio channels in the WebGL platform.