BUZZING from PP2+

[Dantoth16]

I have a PP2+ powering my rig and all of a sudden (after adding a TC Flashback x4) I'm starting to get a buzz.
From the previous forums I've read, the PP2+ can handle the Flashback x4 through ports 5 or 6. I currently have it in 5.
I've gone through patch cords, and power cables and I have to say I'm stumped. Nor do I know if this is a new grounding issue or an issue caused by an electro-magnetic field from the power supply.

Any help would be great! Thanks.

[Rez]

Certainly, powering the Flashback X4 from output 5 or 6 should work great (and normally does).

If you test the Flashback (and then other pedals too if necessary) by picking it up and away from the pedalboard and power supply does the noise become less?