    # File lib/rubygame/deprecated_mixer.rb, line 80
      def self.open_audio( frequency=nil, format=nil, channels=nil, buffer=nil )

        Rubygame.deprecated( "Rubygame::Mixer", "3.0" )

        frequency ||= 22050
        format    ||= SDL::Mixer::DEFAULT_FORMAT
        channels  ||= 2
        buffer    ||= 1024

        result = SDL::Mixer.OpenAudio(frequency, format, channels, buffer)

        if( result < 0 )
          raise( Rubygame::SDLError,
                 "Error initializing SDL_mixer: #{SDL.GetError()}" )
        end

        return nil
      end