In stereo recordings of acoustic music, side information is very often related to ambience, while center information gives an idea of the distance between the listener and the sound source. For example, with SI-1 it is possibile to improve mono compatibility or attenuate the reverberation to focus on central image by lowering the side control slider. On the opposite, to widen the stereo image of a stereo recording, lower the center control slider.

SI-1 will be also useful to video makers that use a camcorder with a stereo mic and need to reduce lateral noises and ambience, for example,  to focus on a dialog that is taking place in front of the camera.