I'm sorry, I can see how my statement is confusing.
The best was I can describe the sound would be if you held an aerosol can in your hand and shook it so the ball would trace the inside of the can... not so much a rattle as a controlled spin
Best Location guess would be just right of the front left wheel, couldn't be more then a foot away at worst. I just went outside now to try to locate exactly where the sound was, but I couldn't get anything outta it, I need to drive a bit first. The car still feels smooth, there isn't a vibration that has been noticeable, just the noise, and my ABS light.
The noise only comes when I accelerate the car, it'll quiet down as soon as I release the gas. Doesn't matter what the RPM'* are at, it happens at the slightest touch.