If you use it you had better check your audio presentations on browsers with Flashplayer 9 installed on your computer (most by now).
I have always considered it to be the internet's worst solution for putting audio on a website but it just got worse.
For some reason Flashplayer 9 does not agree with some SWF producing softwares audio and makes them sound like chipmunks. (this is the same problem Camtasia produced SWF Videos are having).
Flashplayer 9 was released by adobe in December replacing flashplayer 8.
For those of you who are not aware flashplayer is what makes it so you can view things like youtube video and audio buttons etc around the web. It automatically updates when the user is prompted so anyone who views or listens to any type of flash content on the web on a regular basis has been prompted to update.
Anyone visiting a site with a web audio plus button on it who has flashplayer 9 installed will not hear your audio normally... it will sound like two chipmunks fighting occasionally through the play of your audio.
This issue did not only effect web audio plus... another software that I am not a fan of, Camtasia Studio, has the same problem with any video that was rendered as an swf. In that case the easy fix is to render as flv instead.
But with web audio plus there is no fix to the chipmunks. The only solution is to throw that piece of junk in the trash and start over with something that does not convert your audio into an swf file but rather plays it natively as an mp3 file without converting it to another format.
Most professional audio player solutions provide players that play your mp3 file externally.