The current status of the mpd transport
@:optionaloptionalxfade:Null<Float>
@:optionaloptionalvolume:Null<Int>
@:optionaloptionalupdatingDB:Null<Int>
@:optionaloptionalstate:Null<State>
@:optionaloptionalsongID:Null<Int>
@:optionaloptionalsong:Null<Int>
@:optionaloptionalsingle:Null<SingleState>
@:optionaloptionalresponse:Null<Response>
@:optionaloptionalrepeat:Null<Bool>
@:optionaloptionalrandom:Null<Bool>
@:optionaloptionalplaylistLength:Null<Int>
@:optionaloptionalplaylist:Null<Int>
@:optionaloptionalpartition:Null<String>
@:optionaloptionalnextSongID:Null<Int>
@:optionaloptionalnextSong:Null<Int>
@:optionaloptionalmixRampDelay:Null<Float>
@:optionaloptionalmixRampDB:Null<Float>
@:optionaloptionalerror:Null<String>
@:optionaloptionalelapsed:Null<Float>
@:optionaloptionalduration:Null<Float>
@:optionaloptionalconsume:Null<Bool>
@:optionaloptionalbitrate:Null<Int>
@:optionaloptionalaudio:Null<{sampleRate:Int, channels:Int, bits:Int}>