old_contents: from mpf.config_players.plugin_player import PluginPlayer
  
  
  class MpfSoundPlayer(PluginPlayer):
      """Base class for part of the sound player which runs as part of MPF.
  
      Note: This class is loaded by MPF and everything in it is in the context of
      MPF, not the mpf-mc. MPF finds this instance because the mpf-mc setup.py
      has the following entry_point configured:
  
          sound_player=mpfmc.config_players.sound_player:register_with_mpf
  
      """
      config_file_section = 'sound_player'
      show_section = 'sounds'
  
  
  player_cls = MpfSoundPlayer
  
  
  def register_with_mpf(machine):
      """Registers the sound player plug-in with MPF"""
      return 'sound', MpfSoundPlayer(machine)
  
new_contents: from mpf.config_players.plugin_player import PluginPlayer
  
  
  class MpfSoundPlayer(PluginPlayer):
      """Base class for part of the sound player which runs as part of MPF.
  
      Note: This class is loaded by MPF and everything in it is in the context of
      MPF, not the mpf-mc. MPF finds this instance because the mpf-mc setup.py
      has the following entry_point configured:
  
          sound_player=mpfmc.config_players.sound_player:register_with_mpf
  
      """
      config_file_section = 'sound_player'
      show_section = 'sounds'
  
      def get_express_config(self, value):
          """Parse express config."""
          return {"action": value}
  
  
  player_cls = MpfSoundPlayer
  
  
  def register_with_mpf(machine):
      """Registers the sound player plug-in with MPF"""
      return 'sound', MpfSoundPlayer(machine)
  
subject: add express syntax to sound player