Flash 8 A Question About The Edit Envelope

In flash 8 the custom Edit Envelope you use to lower or heighten a song's pitch, but after making like...hold on let me get a screenshot.

http://www.mediafire.com/convkey/c65...16nq2l10zg.jpg

The 4 boxes I highlighted, it appears after using them times you can no longer edit the pitch. Well you can, but you can't add anymore boxes so using it to make the music go faint where the VAs can be heard, well no luck. XD My question is, is there a way to add more of those boxes so I don't need to stop the music, make it restart on another layer and repeat whenever I need to change the pitch?

I could do it in audacity if I really need too, but doing it in flash 8 would be a lot easier.