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Hi Steve, all,One observation that I will make here is that the jitter around the tone is much less with the Synchro-Mesh. The baseline noise level is higher, but this is still in the noise and I would argue not audible. The difference in the hot pink plot and both the blue and flesh colored plots that concerns me about the Gustard is the widening of the tone spike at the bottom. I have correlated this shape to degradation in audio quality in the past. The Synchro-Mesh plot has virtually no widening at the base.
If you believe my premise that it's the correlated jitter that is more audible than random jitter, then the widening of the base of the fundamental in this plot is precisely that, jitter that is frequency modulation close to the the frequency of the fundamental. The Synchro-Mesh plot contains zero of this.
Are you aware of any studies that look at this? I did one quick google and found this:
https://pdfs.semanticscholar.org/d9bf/d506271a8c38cf0f77e6edfbffebf5e368b6.pdf
but I'm well outside my area of expertise here.
I'm not sure what an experiment to test your hypothesis ("correlated jitter ... is more audible than random jitter") would look like, but I'd be interested in the results.