## Music Players

The programs that play the songs and sound effects in this system during the actual games are called the "Music Players". If you compare the song data to a CD (Compact Disc), then you could say that a "Music Players" is like a "CD Player" that you play CDs on.
Note that this system allows you to set up multiple Music Players and that each of them can be made to play different songs at the same time. For example, you could have one open for background music and three open for sound effects, allowing you to have three different types of sound effects while listening to music in the background.

Figure: Conceptual Diagram of Actual Playback

When setting up multiple music players with this system, each player will have its own operating region m4a_mplay???, where the question marks represent the three-digit player number that is assigned. Note that most of the sound functions have arguments that point to these operating regions, allowing them to judge which player to operate. This is, for example, similar to the function fprintf() in standard C having the argument (File *) fp1 as a pointer.

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