I am having difficulty incorporating sound files (both .wav and MP3) into a Flash project. When testing the files after importing them into the library, they sound fine but, after inserting them into the project, the 's' sounds are 'lispy' and the overall quality is similar to someone speaking into a barrel.

I have tried adjusting the compression settings but nothing I try seems to have any affect on the quality of the files after they are inserted into the project.

Has anyone else encountered this problem and, if so, how did you resolve it?