This chapter has accomplished several things. The easiest thing you learned is that MIDI files and WAV files both get loaded into segments and Played the same way. However, you also did a little reorganization of the audio engine (setting the stage for chapters to come), and you learned how to send and receive DirectMusic p-messages.In the chapters to come, you'll learn how to Play other types of sound files (including Ogg Vorbis and MP3), before you come back to the glorious segment and performance interfaces and really crack them open, when you learn about dynamic music.