voice_ramp_volume - Starts a volume ramp for a voice. Allegro game programming library.

       Starts  a  volume  ramp (crescendo or diminuendo) from the current volume to the specified ending volume,
       lasting for time milliseconds. The volume is a value in the range 0-255.

       voice_ramp_volume - Starts a volume ramp for a voice. Allegro game programming library.

voice_set_volume(3alleg4)

Allegro                                           version 4.4.3                       voice_ramp_volume(3alleg4)

#include<allegro.h>voidvoice_ramp_volume(intvoice,inttime,intendvol);