    # File lib/rubygame/sound.rb, line 365
      def fading?( direction=:either )
        return false unless channel_active?

        case direction
        when :in
          SDL::Mixer.FadingChannel( @channel ) == SDL::Mixer::FADING_IN
        when :out
          SDL::Mixer.FadingChannel( @channel ) == SDL::Mixer::FADING_OUT
        else
          SDL::Mixer.FadingChannel( @channel ) != SDL::Mixer::NO_FADING
        end
      end