Sound Flag Summary - Nintendo GAME BOY Programming Manual

Game Boy Programming Manual

3.4 Sound Flag Summary

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Pre-loaded sound effects A and B can be played simultaneously using system commands.
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The A sound effects are formants, primarily action sounds, and the B sound effects are looping
sounds, primarily ambient sounds.
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The interval (frequency) for these sound effects can be set to 4 levels.
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Changing the interval A allows a completely different sound effect to be obtained with the same
sound source. In addition, the volume can be set to 3 levels.
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