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AUDIOSTREAM(3) Allegro manual AUDIOSTREAM(3)
AUDIOSTREAM - Stores an audiostream. Allegro game programming library.
typedef struct AUDIOSTREAM
int voice; - the hardware voice used for the sample
A structure holding an audiostream, which is a convenience wrapper
around a SAMPLE structure to double buffer sounds too big to fit into
memory, or do clever things like generating the sound wave real time.
While you shouldn't modify directly the value of the voice, you can use
all of the voice functions in chapter "Digital sample routines" to
modify the properties of the sound, like the frequency.
Allegro version 4.4.2 AUDIOSTREAM(3)