Great to know. Maybe I'll start looking for one.
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Glad it worked out well for you. I recall the related discussion a while back in this thread.
I wouldn't call it voodoo, though. It just means that like pretty much every other component design, the PerfectWave DAC is not, er, perfect :-)
I don't know specifically how the NativeX function works, but I would expect that if detailed design information were available it would not be hard to hypothesize ways in which your findings could be explained. For example, extraneous high frequency spectral components on the incoming signal, associated either with jitter or simply with digital noise, could to some degree find their way through stray capacitances, grounds, power connections, etc. such that they bypass (couple around) the jitter reduction circuitry, and thereby affect the clocking of the dac chip to some degree.
As you said, though, there is "no substitute for trying things out yourself." Those kinds of effects will generally have little if any predictability.