(sometimes we provide two download links because it may happen that the main server / link is overloaded or slow or non responding - the files are identical. Just choose one, save to the Desktop, double click to install)
This is a program that splits sound taken from the microphone into its basic frequencies and displays them real-time in a window. You can whistle to the microphone and see the plot going up and down with the change of pitch. The program uses the Fast Fourier Transform (FFT) algorithm.