Question system audio to audio clip

i've been trying to figure out how to get the system audio to an audio clip for an audio visualiser for a while not but i cant seem to figure out how. i've tried using Naudio and CSCore but neither of those seem to be able to turn the audio in to a .wav or a .mp3 to then be put into an audio clip.

does anyone know any other solutions?

(also im on windows if that helps at all)

 

var uwrm = UnityWebRequestMultimedia.GetAudioClip(new Uri(Mp3FilePath, UriKind.Absolute), AudioType.MPEG);
yield return uwrm.SendWebRequest();
if (string.IsNullOrEmpty(uwrm.error))
{
//play audio
MAudioSource.Stop();
MAudioSource.clip = DownloadHandlerAudioClip.GetContent(uwrm);
MAudioSource.Play();
}

 

can you explain this a bit more? sorry im not quite sure what a lot of these things are