1. What do you want or need? To my ears, that recording is going to be hard to improve because the loud parts are pretty brickwalled.
  2. There are some things you can do with mastering software (or cleanup with RX9) but if the source is so clipped/distorted there's not a lot you can do to improve it I think.
  3. No wonder it's like that, I recorded it in my pocket! I would like it to be made a bit quieter overall so that I can play it on my speakers. I don't have Audition.
  4. Download audacity (free) and normalize it.