al_set_audio_stream_pan - Allegro 5 API
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#include <allegro5/allegro_audio.h>
bool al_set_audio_stream_pan(ALLEGRO_AUDIO_STREAM *stream, float val)
Set the pan value on an audio stream. A value of -1.0 means to play the stream
only through the left speaker; +1.0 means only through the right speaker; 0.0
means the sample is centre balanced. A special value ALLEGRO_AUDIO_PAN_NONE(3)
disables panning and plays the stream at its original level. This will be
louder than a pan value of 0.0.
Returns true on success, false on failure. Will fail if the audio
stream is attached directly to a voice.
al_get_audio_stream_pan(3), ALLEGRO_AUDIO_PAN_NONE(3)