I can confirm it works with my 568.2mm. Need to listen to some music to tell whether it's doing anything, especially with the 568 sitting downstream of my HD621.

Many thanks to all concerned.

Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.

Purdeys, Moke, Leica, 'Blad. Only the best.