I had a scene in a short film I did last year where I did something fun.
The film is a period piece, so no modern sounds anywhere. A woman is sitting alone in a room contemplating a potion she's in the process of making that will kill her unborn child - saving it from her abusive husband.
I put a clock in the room (even though there wasn't one ...
This is not my forte by any means, but a few thoughts come to mind...
Air traffic. Planes, helicopters? You did mention planes though...
Music? playing in passing cars, out a window
Utilities? steam vents, transformer buzz?
Street vendors? calling out wares etc.
Not sure how many of these would fall under the 'anxiety ...
Manually adjusting the gain during the recording is never a great idea. Your reactions are sluggish, so you'll probably have some seconds of clipped sounds that you'll have to throw away anyway, and then you have inconsistent levels that you'll have to compensate for somehow in post.
The H6 offers a couple of solutions for this: backup record and an onboard ...
Ding dong! Metro/subway/train doors opening, is one of my favorite city sounds.
But I'm assuming you're dealing with exterior shots based on the ideas you've thrown out already.
How about that muffled bassy thump that you can hear in a passing car or outside a club? That's the "pulse" of the city, and it's never far away even in the middle of the day.
I had just this problem when recording ing London. A siren went past. I had my limiter kicked in but the squash it applied was still audible, i.e. as the siren receeded, everything else faded back in. Personally, I would write off blended sounds like that and hang out for cleaner takes.
You might go out for a day with your gain set much lower so that you'...
I use a stereo pair of DPA 4060s clipped to the outside of a bag (this ensures they are about 40cms apart) going into a Sound Devices 302 mixer into an Edirol R09 recorder, both of which are inside the bag.
These are the clips I use:
I haven't used this setup ...
I´ve done some stealth recordings with a pair of Soundman OKM plugged to a Zoom or some portable recorder that you can have in your pocket or bag.
They look like ear plugs and the quality you can get from them is surprisingly good! Totally recommend!
I have always love David Lynch's choices for BG's. The low end drone in Bill Pullman's house as he walks down the hallway into the darkness or the CCTV footage outside his house. Also, the sound of Rossellini's apartment building is truly haunting and unnerving. Great stuff.
The scene in Barton Fink where Fink arrives at the hotel for the first time. The previous scene of waves crashing dissolves over the lobby shot but we still hear the waves.
Didn't have any luck finding a clip on youtube but there's a clip here http://www.avclub.com/articles/barton-fink,33399/
Interesting article too.
Hope that helps! :)