hi all - i'm having a home built and having lots of pre-wiring done. 7.1 for the living room, pre-wire for the office, bedrooms, etc. the thing is they're going to run all the wire in the ceiling and just leave it up there. they're not going to punch any holes in the drywall in the interior of the house -- which is what i want. so, i'm wondering, down the line, how i'm going to find the wires. the home seller guy told me they use something called a tone generator to "trace" the wire to it's end-location. anyone ever use one of these? i did a google search and came up with something like this. http://bkprecision.com/www/np_search...Cable+Tr acer is that what i need? looks like all i do is attach the doo-hickey to the end of the wire, then use the other doo-hickey to follow the wire? as i'm having all the wiring home-run to my media niche, it would be nice to figure out which wire is going where. thx!