I recommend you guys download this software. It's free. There is a function called noise removal in it which I find very helpful. For example, certain BGMs might have the wind sound which is annoying. Using this software, you can remove that particular by choosing a portion where only that sound can be heard. Then after you have selected the noise, you can apply the effect to the whole track. The software can remove the noise even if it is mixed with the main audio...
Download here: http://audacity.googlecode.com/files/audacity-win-unicode-1.3.9.exe http://indian-music-bgm.blogspot.com/ http://www.facebook.com/elensar5233
