My first large scale redstone creation. I'm pretty new to redstone so it isn't that impressive. I'd love it if you download it and give it a try.

How It Works:

1) With both levers down, this causes pistons to extend.
2) Once the button is pressed, the signal will loop around while powering the piston slots. Slots are controlled by a clock.
3) When you press the button to stop it, the pistons will un-extend and make the slots stop.

Look in the back of the machine for the mechanics, it's in creative mode.