New Post: Realtime audio visualization of "what you hear"

I created a device with

WasapiLoopbackCapture.GetDefaultLoopbackCaptureDevice()

and a waveStream with new

WasapiLoopbackCapture(device).

It's recording everything being played through my speakers (I tried saving it to a file and it works), but I'm lost, and I can't find how do I add the visualizer to the project, so it reads from the stream, not from the file.
In the demo you are using

var inputStream = new AudioFileReader(fileName);

to start playback and visualization from the file using FftCalculated & MaximumCalculated and other methods, right?
Can't I read from the stream, not from the file?
Do I have to save stream to a file, playback and visualize it with AudioFileReader(), remove, and save again continously?