ASIO Audio Chain question

This is a follow-on to another question that I posed last night:

What designates what devices and virtual devices that Pianoteq can "See" as outputs in the ASIO audio chain space?  I am trying to use an automated equalization balancing system (Dirac) which has a virtual audio driver that is not showing up as a Pianoteq output under ASIO, though it does show up as an output in ASIO4ALL.

Edit:  And I also found that it shows up in the "Generic Low Latency ASIO Driver" as a Pianoteq output choice as well, showing up under "Active Output Channels" there, but the latency is still poor, and the volume is quite lowered as compares to ASIO4ALL and my straight Steinberg UR22mkII ASIO driver.  ...I just wish that I could get Pianoteq to output straight to the Dirac Virtual Audio Driver, directly!

David