Nice article. I always feel people overlook Rane with their contribution. It's always an Old-vs-Pioneer(new) argument. The Rane mixer has a phenomenal 3-band isolator built-in, albeit not with the large knobs, so many dismiss it as a true isolator. That being said their circuit is a great one, hi, mid, low off, no sound, not the pioneer -30dB or whatever they do.
But again, great article, with solid info...