void ReadText_timer_Tick(object sender, EventArgs e)
        {
            int i = Properties.Settings.Default.save_index_read;

            if (i < readList.Count())
            {
                Speak.SpeakFileText(synthesizer, readList, i);
                i++;
            }
            else
            {
                i = 0;
            }

            Properties.Settings.Default.save_index_read = i;
            Properties.Settings.Default.Save();
        }