Tenting home for termites

I've had my house tented for termites a couple of times. No problem with my rig.

I wouldn’t do anything like covering speakers, wrapped electronics, etc. you don’t want to take any chance one of those little critters is protected by precautionary measures. Kill ’em ! Kill 'em dead!

Have you considered Cedarcide? 
I don't know of any insect that can survive their spraying and fogging. Originally they had a contract with the D.O.D. to kill desert fleas and spiders for our troops overseas and it's something like 99% cedar oil.
I don't know of 
It's natural and organic but smells like you've just taken a bath in cedar oil. No worries though as it can't hurt you or your family or pets (best thing for fleas: you'll see them jump off your pets). 

You can fog it directly on dishes, clothing closets, bedding, etc.

Good luck and hope this helps,
Nonoise

any grill cloth will absorb 

Do they use a gas - or is it some kind of vapor/mist/fog (i.e. wet)

If the latter - I'd get my system out of the house - especially my speakers - they have paper cones.

Thankfully - termites don't survive the winters up here in Canada!