DragonFly On-Line Manual Pages
ALLEGRO_AUDIO_PAN_NONE - Allegro 5 API
#define ALLEGRO_AUDIO_PAN_NONE (-1000.0f)
A special value for the pan property of samples and audio streams. Use
this value to disable panning on samples and audio streams, and play
them without attentuation implied by panning support.
ALLEGRO_AUDIO_PAN_NONE is different from a pan value of 0.0 (centered)
because, when panning is enabled, we try to maintain a constant sound
power level as a sample is panned from left to right. A sound coming
out of one speaker should sound as loud as it does when split over two
speakers. As a consequence, a sample with pan value 0.0 will be 3 dB
softer than the original level.
(Please correct us if this is wrong.)
Allegro reference manual ALLEGRO_AUDIO_PAN_NONE(3)