Step 1: Part and tools
power source(I used a 9v with an adapter)
4- 5k linear potentiometers
200mm linear SoftPot(you can go smaller than this I just used this length because its what I had)
optional: Arduino holster(I had this made using a MakerBot) for easily removing the Arduino if you want to use it for something else.
all of this I was able to get off jameco.com except the SoftPot which i found at trossenrobotics.com
For the box:
Acrylic pane(found mine at Lowe's)
Weld-On 4(found on Amazon)
Weld-on applicator bottle
Step 2: Wire It Up
First just line up the five pots with the SoftPot. Then wire the first pole of each post together and solder it. The do the same with third pole. Then solder a wire to each of the center poles. The SoftPot center pole needs to connect to the A4 pin, the second pot's center goes to A3, the third pot's center goes to A2, the fourth pot's center goes to A1, and the final pot's center goes to A0. Then on the fifth pot solder another wire to the left and right poles, with the left pole connecting to the 5v pin and the right pole connecting to the GND right next to it. The only thing left is to connect an audio output jack with the hot going to ~3 and ground to GND.