Cool Edit is made by

CoolEdit is a very powerful audio editing program that is offered in different software packages. 
Below is a table showing the different versions that are available.  The lite edition used to be offered free of charge, but now
it's almost $40.  You still can try the program for a 30 day trial period to see if you like it. 

Even with the fee, this still is a top-of-the-line audio editing program, and one of the best for the price. 

Download a trial of CoolEdit 2000