Actually it only uses a lot of CPU when it's not playing music.
No, Mr Belmont! I am serious here.
Take a look at this diagram.
http://img222.imageshack.us/img222/1207/diagramlf2.pngAs you can see, on a dual processor system, it uses both cores when not doing anything. And it uses 100% of one core when playing a song. On a single processor system, 100% of the CPU is used by audio overload all the time when it is running.
Now, I would say that this is a very serious glitch. It would drive up the processor temperature, and on laptops, drain the battery quickly.
This is also a waste of processor time.
For example, if one young chap wants to encode some mp3s and listen to the soundtrack of "Seiken Densetsu 3" at the same time, surely his mp3 encoding will take a lot longer because Audio Overload is using a lot of the CPU time (which would otherwise have been put to better use).
And because he didn't get his mp3s encoded on time, he is late to work, and his boss is angry and cuts his salary. And then the stress of financial trouble could drive him to alcohol. After this, because of his drink problem, his wife leaves him.
Lives could be ruined this way.