SYNOPSIS
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#include <allegro5/allegro_audio.h>
bool al_set_mixer_gain(ALLEGRO_MIXER *mixer, float new_gain)
DESCRIPTION
Set the mixer gain (amplification factor).
Returns true on success, false on failure.
SINCE
5.0.6, 5.1.0
al_set_mixer_gain(1)
Allegro 5 API