Nothing yet... I don't think it's function is enabled... it's installed, and can be 'clicked' but I think some server development is behind this... I'm not sure where theree going with it..., but it's just possible one of three things... better notch for those with ELF transmission noise below 22kHz,,, better, movable notch, period... or three: it may have something to do with aliasing on the higher freqs... the addon filters have been limited to 220kHZ... so something was happening... I wondered if some blues, even a few reds, might generating aliasing above 250lHZ with the current desired sample rate of 500kHz... a lot of stuff going on