I had been waiting for Voxengo to release this functionality in a standalone plugin. I would have paid for it, but here it is for free. Voxengo is legendary in my book for dropping incredibly useful metering plugins for free that outperform competitors' plugins that run over a hundred bucks. SPAN, Correlometer, MSED, Stereo Touch, Sound Delay get used on every job. Correlometer lets me pinpoint phase problems immediately, which is a huge time-saver. I don't find single correlation meters to be much use when compared to one like this that shows the whole spectrum. It just seems anyone who cares about phase would want to know where the cancellations are happening. This solves that... for free. I also love how Voxengo lets you tweak metering behavior to taste. Even when I try metering plugins from other Vendors or get the occasional NFRs, I always seem to prefer Voxengo's free plugins anyway.