On my home stereo I have a spectrograph that has a 2D matrix, whereby the X axis is the frequency (deep bass on the left, vocals in the center, treble on the right), and the Y axis is the volume or power of the sound at that frequency. I have seen things like this for Ubuntu, but they work on MP3 files or other pre recorded songs. Is there anything that can do this real time for a microphone attached or simply the system mixer?