Can you tell me how HQP works?

[orgel (David Orgel)]

Here’s a good, succinct explanation of what HQP does (IMO):

Sound quality - not as good as other programs?

This is sound and well reasoned advice. You speak to the virtues of A+ for those using Mac-based systems. For those with Windows-based systems, HQPlayer is the counterpart (although HQP also plays on Macs). I know that Esoteric has done a huge amount of work on its own internal upsampling process and that may be a significant part of your great sound. But for many, if not most, other DACs the ability to upsample to high rate PCM (for Chord DACs and some others) to DSD 256 or 512 (for most ot…

I’ve not had a chance to fool around with the Yggdrasil, but I suspect that because of its design, it might not be the DAC that benefits most from upsampling/filtering in software upstream from the DAC.

(Sorry for not being @miklats)