DOKK / manpages / debian 10 / allegro4-doc / voice_sweep_frequency.3alleg4.en
voice_sweep_frequency(3alleg4) Allegro manual voice_sweep_frequency(3alleg4)

voice_sweep_frequency - Starts a frequency sweep for a voice. Allegro game programming library.

#include <allegro.h>

void voice_sweep_frequency(int voice, int time, int endfreq);

Starts a frequency sweep (glissando) from the current pitch to the specified ending pitch, lasting for time milliseconds.

voice_set_frequency(3alleg4)

version 4.4.2 Allegro