Been trying to read about it, but can't say I've figured out what it does..."cleans up the signal", "makes the receiver of the DAC not work so hard", stuff like that (it's a bit like reading this thread, as a matter of fact). Does seem to improve the sound, though...they're going wild over it on Computer Audiophile.
Have 2 DACs that are vintage or R2R...not using either of them at the moment, but making me rethink it and maybe give it a try. One, as I mentioned, is the Mojo Mystique, which I got as a prototype, no case, think I should maybe send it back, just have it finished, as it is finicky (but was great sounding when I did use it). The other is a Meitner Bidat, which I have had out of my system for ages, since the associated transport died, but I understand someone who was connected to Meitner is upgrading them, may be worth looking into. Ah, more to spend money on...I was getting nervous, no orders in the past couple of weeks