| There has been a couple threads about the phase flip trick before but I can't remember the titles off hand...
I think if they are really pro they could easily stand there for a few minutes to get the phase-reversed take. I've had middle schoolers stand still while I got a couple minutes of silence to use in a noise-removal plug-in.
Tell them the situation and what you need. They will probably be impressed by your knowledge of physics and all that, as long as you don't sound like a crackpot! Use simple language, unless you happen to have a physics buff present!
Let us know how it turns out. |