What is "this"? You would not use this chip to listen to voice unless the goal is to distort the sound. This has an analog output (in the general case). You would not feed it into a digital device.Look at this.
Don't see a lot of hardware info there. I'm sure he covers that chip in one of his posts.I would guess you want this chip to help determine brightness/color of 1/8 of your cubeI could see using one analog input reading a filter output, doing whatever calcs you require,drive the LEDs through PWM, step to next filter and repeat. Is that the idea?