get_hardware_volume - Retrieves the hardware sound output volume. Allegro game programming library.

       Retrieves  the hardware sound output volume, both for digital samples and MIDI playback, as integers from
       0 to 255, or -1 if the information is not available. Parameters digi_volume and midi_volume must be valid
       pointers to int, or NULL if not interested in specific value.

       get_hardware_volume - Retrieves the hardware sound output volume. Allegro game programming library.

set_hardware_volume(3alleg4), get_volume(3alleg4)

Allegro                                           version 4.4.3                     get_hardware_volume(3alleg4)

#include<allegro.h>voidget_hardware_volume(int*digi_volume,int*midi_volume);