Logic is NOT like soundforge/Cool Edit Pro, etc.
Logic is more for midi and music creation, though it does handle all types of audio.
For editing wav files and such there is no comparable Cool Edit Pro/Adobe Audition program for the Mac, unfortunately.
Most use Pro-Tools, Peak (which many hate), or an old program that has been discontinued called SparkME. Those are perhaps the best for only working with audio files.
Soundtrack Pro 2 by Apple seems to fit the bill, but they do not sell it by itself unfortunately.
Then also there is Cubase for OS X. I think they have a demo you can try.
I have a windows PC in my studio only for running Cool Edit Pro for this very reason. No CEP or Soundforge on Mac, and I need the nice filters and such from CEP. :-(