The VI-3 series of automatic audio/video switches allows two different S-VHS video devices (i.e., a laser disc player and a VCR) to be connected to a single monitor. The VI-3 detects which source is delivering a signal and routes the signal to the monitor. This eliminates the need to run one video device through another, thus preventing any signal loss. The VI-3 detects the video signals of the B input device to determine when to switch. The VI is designed so that if both signals are present, the VI-3 will give priority to the device on the Video B connection. The VI-3 can be used to allow a laser disc player and a VCR to both have direct connection to the monitor. This eliminates operating confusion as well as line noise through excess wiring. Since the VI-3 can be used to switch audio, it is particularly suited for use in home surround sound systems where the hi-fi system and surround processor share the same power amplifier. The VI-3 offers automatic switching of the input signal to the power amplifier.

The VI-3 is designed to switch Y/C (S-VHS) video signals and stereo audio, while the VI-2 is designed to switch composite video and stereo audio.

Another alternative: VR-2Y