OptionalarbiterOptionaldestinationOptionalloadDefaults to embedded asset loading, including worker-rendered MIDI; customize with createAudioLoader.
Optionalstreamasked first for BGM and BGS: a source it returns plays through a StreamChannel, so a long
or endless track never becomes a whole AudioBuffer; null falls through to load
the voice limit shared with
SfxSounds:playSeasks it for a slot atBusTrack.priority