This is the basic set-up:
Arduino UNO
One Adafruit NeoPixle (8)
One 3~6V Sound Sensor Module for Arduino

The Sound Sensor is hooked up to Arduino like this:

GND to GND
VCC to 3.3V AND the AREF (next to GND on the Digital side)
A0 to A5 on Arduino (this you can change to what suits you)
D0 to D2 on Arduino  (not used in the code)

The NeoPixel is hooked up to Arduino like this:

GND to GND
4-7VDC to 5V
DIN to D6 on Arduino

Has added Brightness control and change NeonPixel from 16 to 8 in the code.

Adjust the gain on the Sound Sensor for correct NeoPixel display.