The sort of audio/video switch you can use to switch between 2 devices. The output goes to a 3rd device.
In this example I hooked up the kid's PC to an old composite-only analog TV via a VGA feed (a standard PC video connection) to an analog PVR (or personal video recorder - a box with a hard drive in it).
The sound is sent through a Logitech 5.1 amp/speaker system via a 2-in 1-out switch (pictured) to allow a swap between the DTV-B (digital TV - broadcast) STB's (set top box) audio and the PC audio-out. It works!
That's the audio switch. I could have switched video through it as well but I use the analog PVR to do that and just feed the main stereo audio through here, with the other speakers going direct.
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