Sphero Symphony

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Logo used on inserts.

Sphero Symphony is the name (not even a trademark) given by SNK to the use of stereo in some early NeoGeo games.

As it can be seen in the Art of Fighting's source code file sys/SOUND.SRC, the process simply pans sound effects left, center, or right, depending on the sprites positions on the screen. Since the NeoGeo only has 1-bit panning for FM channels, there are only 3 different zones with constant power:

  • Left, full volume
  • Left + right, half volume
  • Right, full volume

Panning is set by the game engine through special commands sent to the sound driver.

Nothing more than that.