Step 2: Build the circuit and connect the sound source
Pin 5 may get a little confusing. What happens there is pin 5 goes to node "A". Node "A" attaches to a resistor (1M) which goes to ground. Node "A" also connects to the negative of the capacitor.
Other than that it is straight forwards. The negatives of the LEDs face the chip. The positive ends of the LEDs are connected to the source.
The Input. Now this is porbably the most important step. The input comes from sound card on my computer (to be able to listen and view this effect you need to get this: http://www.monoprice.com/products/product.asp?c_id=102&cp_id=10218&cs_id=1021802&p_id=667&seq=1&format=2&style=
The male end of the above goes to the sound card where you speakers are now. One female end is connected to the speakers you just unplugged. The other end will be this:
You take 1 end of this and cut it and split the wire to look like the picture shown.