Sets the priority of the AudioSource.
Unity is virtualizing AudioSources, when there's more AudioSources playing than available hardware channels.
The AudioSources with lowest priority (and audibility) is 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.