ok i have some programs to recommend you, but i think none of them is free
1. Sound Forge
2. Acid Pro
3. Cool Edit 2000 or Cool Edit Pro
4. CakeWalk Sonar
Note sure but i think that CakeWalk Home Studio can do that also.
Are those enough. The link that mrmoustache send you i think is the best one in your case because you could download the demo of that software.