If you are looking for simple you might try Magix Audio Cleaning Lab. I have found it to be pretty flexible when converting my accompnient cassettes to MP3 or Wave to burn to CD. I think the thing I like the best is it is pretty straight forward and simple. Cost a little bit but they do have a trial that you can use to try it out and see if it will do what you want it to.
The link is
http://www.magix.com/us/audio-cleaning-lab/detail/I have an older version at the moment but have tried the new trial. It is $49.00 but if you sign up for their newsletter you can get a $15.00 coupon I think. It says it will import WMA files.
I think some of these plugs came from Magix professional line Samplitude.
Anyway just another way to skin the cat so to speak.....
Terry