I have Roon and HPQ, but unless I missed it somewhere, HQP is still the only software product that can apply a convolution filter to DSD natively.
I'm going from memory, though, and I haven't had had time to be as diligent in reading release notes lately...
(Mike, your DSP solution sounds interesting, as I have two different routes through the Mac Mini that I use as a music server - one for 2-channel audio using Roon/HQP and that uses Loopback for those times when I want to route AV material through my big rig. Perhaps it's worth discussing that in a separate thread?)