Either a filename pointing to a Wave file,
or an object of class Wave.
If the latter, it is written to a temporary file by writeWave,
player
(Path to) a program capable of playing a wave file by invocation from the command line.
If under Windows and no player is given, mplay32.exe or wmplayer.exe
(if the former does not exists as under Windo
...
Further arguments passed to the Wave file player.
If no player and no further arguments are given under Windows, the default is: "/play /close".