I'm looking at the Fourier Transform (really, at a sliding DFT) to analyze (visually and intuitively) the frequency components of a sound over time. But the DFT produces complex numbers, and I'm not sure how or whether to visualize them.
Should I just graph the magnitude of the result?
I've tried letting the argument/phase of the resulting number affect the hue of the graph, but it just looks more or less like a rainbow oil spill. It doesn't seem to help me understand anything about the sound.
Or would just dropping the imaginary part convey just as much?