alListenerf( AL_GAIN, _volume );
alListenerfv( AL_ORIENTATION, _at_up_vec );
// alListenerfv( AL_POSITION, toVec3f(_absolute_pos).data() );
alListenerf( AL_GAIN, _volume );
alListenerfv( AL_ORIENTATION, _at_up_vec );
// alListenerfv( AL_POSITION, toVec3f(_absolute_pos).data() );