The meat and potatoes of most stories: human speech. It's essential to get this part right, because when you don't, people complain. I offer noise reduction, background smoothing, enhancement, re-timing, re-pitching, and any other dialog needs you may have.
What's a good dialog edit without a lush sound design, filled up with the perfect footsteps, subtle ambiances, and dramatic explosions? I may have a comprehensive sound library, but I also have an entire literal mountain to record all sorts of sounds your city-based production may not have access to.