Thanks for the link, but unfortunately it is no help - I have gone through the same process with my Dayton mic. and the HD621. No sound from any output channel using Asio4all and Java. The output supposedly controlled by REW does not work, nor does it work with control passed to the 568 (boxes unticked). The SPL meter in REW works fine when measuring configuration levels to time align the subs and mains.

Home: BDP-103,G61R, HD621, Quad520f, 2xInnersound amps, 3xQuad ESL-63s, 2xJL Fathom F112 V1 subs, 2x Gradient SW63 subs.
iFi Zen Stream , Audeze LCDi4.