I have made some head up with my "ghost jitter" problems, and realized I was probably getting some things wrong.
When I first mounted the Cabinetiq, it had almost no Jitter.
But the power adapter I used was fried - ever since I took it out of the box; the last time I buy Chinese stuff in UK - connecting it to the grid led to the differential breaker to cut electricity in the flat.
It leaked directly to the "Earth" , so it could be used only by disconnecting that pole... then, I tried changing the the F-type plug on its chord with a C type, and fried it completely (probably, I discharged explosively the noise filter capacitor when I cut the cable and, silly me, I did not unhook it from the power brick).
I replaced the power brick, and went merrily along. I didn't realize that the jitter had augmented, nor that it was possibly connected to the power adapter change.
Also, the jitter was augmenting over time... I thought it was because of my overly complex USB set-up, but I got too much used to all the supplementary "hotkeys" and the zoom wheel separated from the brush size wheel (the Intuos4 touch ring) to give it up.
I was getting frustrated and started looking into buy one of those new Monoprice tablet monitors... luckily, they are out of stock.
Then, these last few days there have been some bad storms around here, so I didn't dare to switch my computer on. I used the time to rewire the "zoom wheel", eliminating around sixty cm of unnecessary cables, adding a second "wheel" and placing all of these (and the other buttons associated to the mouses I used as "wheel sources") in a single wood case. Then, I have placed the USB concentrator that I use for the auxiliary input devices below the numeric pad I use for tools selections.
Before it was residing on the desk, somewhere 12 cm below the screen.
Finally, a couple of days ago, in a sunny afternoon I switched my PC on, just a moment to watch my emails, and something crawled through the grid and fried the screen power brick. I had one lying around, so it was not big deal.
Also, I decided to rip the carcasses of the two dead power bricks of theirs' transformer's ferrite nuclei, and use the two of them as common mode reject filters,
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One for the power connection, the other for the USB line to the PC.
What is now annoying is that I do not know if it has been the USB rewiring, or the new power brick, that have almost completely eliminated the jigger!
I'm pretty sure it is a power brick thing, as I have tried plenty of time to exclude all extra USB stuff and failed to reduce the jitter by any significant degree (as an aside, what I did observe was that jitter went up to eleven if there was any kind of heavy-duty hard-disc operation, like an anti-virus scansion or a massive copy).
There is still some "waves" drawing 45º lines ( a bit like in the Huion tablet that I use on my laptop) , but they are "topographical" (small distortion in the way the table sees positions), not the random noise that was there before.
I can fix a ruler on the screen, draw over and again the same line, and the line on the screen does come out the same, each time!
Finally, right now I have more hotkeys than I can really use, and a wheel too much too, but all works perfectly, so I will keep it like this.
The actual aspect of the machine is this,
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I made a video of the thing at work,http://www.youtube.com/watch?v=q1ETuXrztTk
I hope you'll enjoy (if you can withstand my English; beware, it's going to be tough).
Thanks for everything.