Brach,
I tried my Mosky Power Station, it’s a less expensive device like the one spot. It has a 1.0 amp output power supply, and eight 9v, one 12v, and one 18v DC pedal power outputs. The noise is the same with the Mosky as far as I can tell. Would the 12v or 18v DC outputs possibly improve the noise issue? I have only tried the 9v outputs because I don’t know if it’s okay to use the higher voltage on the Quaverato. I’ll email you some photos of the Mosky.
Mike