I was following that late last year and then forgot all about it. Seems like a useful device, although I couldn't help think that; "Damping" = bass "HF" = treble "Depth" = crossfeed
Although the "Gain" is what it says it is and useful.
I'd like to see a full electronic description of what's been done before getting one. Having said that it does have a very affordable price tag. It's just those Spidey senses sniffing something off, hopefully I'm wrong.