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Strumming the main menu makes pip-boy sounds too.

On Firefox, you have to click on the page at least once before mouseover plays audio

You got me, page also have a sound from UFO X-COM

So it is. I thought it wwas something else, but it's X-COM / UFO as you said. On https://sounds.spriters-resource.com/ms_dos/xcomufodefensexc... it's ui_message.wav

Neat site, i've ripped sound by myself.