I downloaded VB Express, it's free without any strings attached.
"How to you hookup the inputs without fear of over voltage?"
How to process the signals MCU-side, beats me. I'd do a search on comparing voltage, I've seen lots of stuff on that.
Just don't even consider feeding that through the USB line. Even a PIC has limitations, I would place some sort of step-down circuit before the PIC. Google is your friend.
Robert
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