Kauna is a music visualizer. Kauna renders any sound reproduction in system. It can also capture audio from a microphone.
There are different dynamic and beautiful visualizations available:
Wave - frequencies as fine lines;
Confetti - colored discs, changing its size;
Bars - rainbow spectrum analyzer;
Burning clouds - bright visualization simulates illuminated clouds;
Plasma - old school effect with smooth transition of colors;
Sound level meter - virtual device for the measurement of volume (DB);
Triangular - light ring with triangles in the background;
and more...

Settings - sound level sensitivity, automatic change of visualizations on a timer, select the sound card.