Nice! When I go the other direction by decimating DSD to PCM, I sometimes choose the filter based on whether some harshness needs taming.I have to say, I've been playing with HQPlayer on an old NUC 7i5 that I now have lying around (because my Roon core is on a fancy dancy new faster, quieter, lower power consumption $136 "supercomputer" from GMKtec, amazing what a few $ can buy these days). Despite its age, the 7i5 is plenty to upsample to 192k PCM, and though I adore my Yggy LIM, it's been quite fun to bypass the onboard filters and play with it @ 192 on ext2, ext3. I like being able to play with the shapers on some of the old "cruddy" recordings I have of early jazz, field recordings by Alan Lomax & such. In my main home I have my Mac Mini M4 doing HQPlayer duty which can handle pretty much anything in the DSD512 world that I throw at it, and I have a different co's DAC inbound that I'm going to try to pair with Freya+N/dual Aegirs/Devore o/96. But here in my seaside shack, I am playing with Roon->HQPDesktop->Ropieee NAA->Yggy LIM->Freya+->Vidar->KLH Model 5 and it's quite fun. Especially because when I'm here I listen to more "interesting but lower quality recordings".
For instance, this is one of my all time faves, but it's got a grittiness to the way the piano was mic'ed that you can, in fact, tame and bring up the low end with poly-sinc-ext2. Hurray! If people are tiring of this upsampling crap, lmk - I'm just saying it has a real use case for Schiit too!
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I bet once your Schiit DACs have the 384-capable Unison USB, you'll be able to get even better results when upsampling.