Localizer is an special 2D audio positioning emulator. It allows positioning of a stereo signal in space, with visual feedback of the positioned signals. It does not only adjust volume but also phase, giving the impression sound is at a specific point in space. Furthermore the includes a directional filter which emulates the anatomy of the head and ear.
This post I will work though the GUI features and explain them.
① A visual representation of the audio input channels and their relation to the audio sink (the ears).
② The radius (distance from the center) of each channel. For each channel a fine and coarse knob exists, to facilitate fine and coarse manipulation of the radius.
③ This knob locks the left and right channel such than a change in one channel will reflect the same change on the other channel
④ Moves the offset vertical or horizontal. Useful for making Doppler effects.
⑤ The separation in degrees between the left and right channel. When this value is negative left and right channels are swapped
⑥ The center rotation. This will be the average angle of the signal.
⑦ Locks the rotation to the offset (④) such that the center angle is always pointing to the sink
⑧ Distance 2 volume factor is the amount of attenuation as the audio source moves further away. 0 means there is no decrease in volume, while 2 is a very strong effect.
⑨ Cross mixing. When enabled the both input channels are mixed to both output channels. When disabled the left input channel is received only by the left output channel, and ditto for the right input and output channels.
⑩ Ear emulator enables a directional filter emulating the human in between, including ears. This also allows the listener to experience sound as if it sound coming from behind when the sources are located behind the sink.