def insert n, *args
      new_frames = self.slice(0, n)
      args.each do |f|
        new_frames.push f
      end
      new_frames.concat self.slice(n..-1)

      self.clear
      self.concat new_frames
      self
    end
def insert n, *args
      new_frames = self.slice(0, n)
      args.each do |f|
        new_frames.push f
      end
      new_frames.concat self.slice(n..-1)

      self.clear
      self.concat new_frames
      self
    end
Inserts the given Frame objects into the given index.