/// <summary>
/// не работает
/// </summary>
/// <param name="delay"></param>
/// <param name="_basicplayer"></param>
/// <returns></returns>
        public async Task FadeOut2(float delay, BasicPlayerFunction _basicplayer)
        {
            try
            {
                TimeSpan time    = TimeSpan.FromMilliseconds(delay);
                int      iVolume = (int)_basicplayer.Volume;//*100;
                while (_basicplayer.Volume > VOLUME_MIN)
                {
                    iVolume = iVolume - 2;
                    double fVolume = 1 - ((float)Math.Log(INT_VOLUME_MAX - iVolume) / (float)Math.Log(INT_VOLUME_MAX));
                    if (fVolume < FLOAT_VOLUME_MIN)
                    {
                        fVolume = FLOAT_VOLUME_MIN;
                        break;
                    }
                    await Task.Delay(time);

                    await Task.Run(() =>
                    {
                        _basicplayer.Volume = fVolume;
                    });
                }
                _basicplayer.Stop();
            }
            catch (OperationCanceledException ex)
            {
                //Do stuff to handle cancellation
                MessageBox.Show("OperationCanceledException " + ex);
            }
        }
        public async Task FadeOut(float duration, BasicPlayerFunction _basicplayer)
        {
            try
            {
                float time = duration;
                while (_basicplayer.Volume > VOLUME_MIN)
                {
                    time -= 20;
                    float volume = ((float)_basicplayer.Volume * time) / duration;
                    await Task.Delay(100);

                    await Task.Run(() =>
                    {
                        _basicplayer.Volume = volume;
                    });
                }
                _basicplayer.Stop();
            }
            catch (OperationCanceledException ex)
            {
                //Do stuff to handle cancellation
                MessageBox.Show("OperationCanceledException " + ex);
            }
        }