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private void button1_Click(object sender, EventArgs e)
    {
      int device = dropDown.SelectedIndex - 1;
      //  Bass.BASS_Init(0, 44100, 0, Handle);

      Bass.BASS_Init(0, 44100, BASSInit.BASS_DEVICE_FREQ, Handle);
      //Bass.BASS_Start();
      if (!BassWasapi.BASS_WASAPI_Init(device, 44100, 2, BASSWASAPIInit.BASS_WASAPI_BUFFER, BASSWASAPIFormat.BASS_WASAPI_FORMAT_16BIT, 0.5f, 0, WASAPI_Callback, Handle)) 
      {
        MessageBox.Show(Bass.BASS_ErrorGetCode().ToString());
        return;
      }
      button1.Enabled = false;
      BassWasapi.BASS_WASAPI_Start();
      //timer = new System.Threading.Timer(ReadWsapiData, null, 0, 20);
    }					

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    private bool UseHelper(int device)
    {
      wasapiHandler = new BassWasapiHandler(device, false, 48000, 1, 0, 0);  // init in shared mode

      if (!wasapiHandler.Init() || !wasapiHandler.Start()) return false;    // start handler

      wasapiHandler.UseInput = true;
      wasapiHandler.SessionMute = false;
      wasapiHandler.DeviceMute = false;
      wasapiHandler.SessionVolume = 1.0f;
      wasapiHandler.DeviceVolume = 1.0f;
      wasapiHandler.Volume = 1.0f;


      BASS_WASAPI_DEVICEINFO info = BassWasapi.BASS_WASAPI_GetDeviceInfo(device);
      string s = string.Format("Initialized device {0}:\n" +
                               "Name:\t\t{1}\n" +
                               "Is Initialized:\t{2}\n" +
                               "Is default:\t\t{3}\n" +
                               "Device Volume:\t{4}\n" +
                               "Session Volume:\t{5}\n" +
                               "Volume:\t\t{6}", device, info.name, info.IsInitialized, info.IsDefault, wasapiHandler.DeviceVolume, wasapiHandler.SessionVolume, wasapiHandler.Volume);
      MessageBox.Show(s);

      return true;
    }