# 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