Property to get, one of:
AL_SOURCE_RELATIVE (int),
AL_SOURCE_STATE (int),
AL_PITCH (float),
AL_GAIN (float),
AL_MIN_GAIN (float),
AL_MAX_GAIN (float),
AL_MAX_DISTANCE (float),
AL_ROLLOFF_FACTOR (float),
AL_CONE_OUTER_GAIN (float),
AL_CONE_INNER_ANGLE (float),
AL_CONE_OUTER_ANGLE (float),
AL_REFERENCE_DISTANCE (float),
AL_POSITION (array(float,float,float)),
AL_VELOCITY (array(float,float,float)),
AL_DIRECTION (array(float,float,float)).