Here is a snap example of using the CSAudioConverter in order to Display audio visualization using C#

CSAudioVisualization-Snap-Example.cs

//Set the mode
audioVisualization1.Mode = CSAudioVisualization.Mode.WasapiLoopbackCapture;

//Set the device index
audioVisualization1.DeviceIndex = cboAudioSource.SelectedIndex;

//Set the quality
audioVisualization1.HighQuality = true;

//Set the interval
audioVisualization1.Interval = 40;

//Set the background color
audioVisualization1.BackColor = Color.Black;

//Set the base color
audioVisualization1.ColorBase = Color.Green;

//Set the max color
audioVisualization1.ColorMax = Color.Red;

//Start
audioVisualization1.Start();