Spectromatic is a program for generating spectrograms from audio
files. Spectrograms are a form of simple time-frequency analysis which
lets you see how the distribution of energy at different frequencies
in an audio stream change over time. For example, if you play a scale
on a musical instrument, you will see a climbing and/or descending
pattern of blobs as you move from left to right.
Spectromatic reads its input as mono or stereo 16-bit wave files, and
writes the output image to an elongated PNG image (colour for stereo,
grayscale for mono audio).