How to best remove/reduce noise/background sound?

How to best remove/reduce noise/background sound?

Pompei2's picture

Hi,

I am absolutely not a sound guy, but I wonder how to do this? When one records sounds with a medium quality recording device, or just outside in nature, there are always tons of background noise! This is really unusable in a game.

As a good example, take this: http://opengameart.org/content/forest-bird-sounds it has very clear sounds but a lot of background! How could I filter that, using only open-source tools?