in flash you can only make some FX with your sound, like make the sound go from left to right, etc, check the sound properties pushing the edit button, you´ll see a couple of options. The other thing you can do is lower the quality of your sound taking down the KHZ, see the sound properties in your library. I recommend you for mayor editing using a software like SONICFOUNDRY´S (SOUNDFORGE6). go here for more information, the software is realy easy to use. Excuse me for bad english, i don´t speak it very well. ok go here and see.

http://www.sonicfoundry.com/PRODUCTS...ct.asp?PID=668