Here's a gotcha you won't find out about until later. When capturing VHS (or any other "live-feed" video) through a converter box into Final Cut Pro, a GSM cell phone's "speaker buzz" can actually be recorded to the captured video clip.
What causes it?
What can you do about it?
Not much, really.
The best thing other than turning off the phone or moving the phone as far away from the speakers as possible is to rotate the phone (adjust it's yaw angle) so the signal is perpendicular to the speaker's amplifiers. But Euler or Tait-Bryan? :)
It's a bit of an old article so I don't know how accurate it is today but be aware that if the speakers on the capturing computer make the noise it can end up being recorded to the captured Quicktime file.
Unless of course you use tube amps and/or have your editing equipment inside a Faraday Cage.