What is the Sound Effects feature in XNA Game Studio 3.0?
We’ve added a new code-based audio API to XNA Game Studio 3.0, which allows you to use the content pipeline to build and load your individual audio assets, and then play them back with a few short lines of code. This API is available on all platforms. XACT provides a very powerful content-driven approach to audio, and we will continue to support our existing XACT audio API in XNA Game Studio 3.0.