Sound and formatting

I added an extremely simple sound engine to it. It sounds shit,
especially at higher speeds, but you should get the gist and if you add
more sounds it can alternate from, it should be fine. Unfortunately, I
didn't have the time to do this myself.

I also fixed some of the formatting "errors" in your code. A lot of
programmers have extreme OCD about this stuff, so you may want to pay
extra attention to it, to avoid future problems :)

As to Tabs vs. Spaces for indenting, use Tabs to indent and Spaces to
align. It's the best practice, IMO. It also saves some space, since Tab
is 1 character, where spaces are many. It can save kilobytes in large
codes ;)