Hey, I want to make a LED music visualizer, i have already wrote a little sketch mapping the analog music input from my computer and making a led bar flashing to the music. But what I really want is to analyze the Songs dominant frequencys (3 or so, for bass, mids and highs) and get their value so i can flash the leds to the frequency (or a factor of them). But this is far beyond my knowledge so im asking here for help. I know there is a Arduino Arduino FFT Library but i got no idea how to use it.
Edit: knowing the frequenzy of the main bassline at all times so the leds change with the changing bassline would be plenty for a start.