currently im building an audio visualizer i would like to know what is the difference between a cascaded 2nd order band pass filter and an inverting band pass filter. which type of band pass filter is the best to be used in building an audio visualizer. i would like to get some feedback on what are the stages for building an audio visualizer. based on my knowledge there should be several band pass filters to separate the frequencies based on my preference. then the signal should be rectified using a diode and a capacitor , and the output will be connected to the LEDS , in my case im using the LM3915 led driver. i would like to get some feedback to improve my design and what would be best to build an audio visualizer.