The Audio Analyzer uses the microphone on your phone for audio input, analyzes it, and displays the result on the screen in real time. The Oscilloscope function draws the waveform of the sound. The Spectrum Analyzer displays the frequency distribution of the sound. It displays 16 bars, each one corresponding to a frequency interval. And the VU Meter reacts to how loud the sound is. See who can give the loudest yell, the most high-pitched whistle, or make the strangest waveform. Play the piano and watch how the frequency changes. Or simply place your phone at your loudspeaker, put on your favorite music and enjoy the lightshow.