I have an interesting problem. We're all familiar with the high mosquito whine digital pedals can produce when sharing a daisy chained power supply.
Usually a simple fix - give it its own psu. I set up a small board to separate my 'always on' from the main board.
Line 6 G75, MS-60B, Sweet Baby, Digitech Ricochet (not actually always on, just used as a pitch shift on one tune). I got the noise which I traced to the MS-60B.
Here's the thing. Nothing fixed it. Power Bank USB, USB 3 pin plug, USB socket in the 4 gang, 9V PSU - still the noise. In the end I resorted to batteries and it works.
So I have a solution but don't understand why none of the other less faffy things didn't work. Any ideas?