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i used to get a high pitch noise with my freeze on a onespot, then i took a bunch of pedals off my board and it seemed to stop. ehx digital pedals have interesting current requirements so daisy chaining causes issues. however, 2/5 of my current board are ehx and i power it with a onespot without any noticeable noise.

or i got used to it

I am running my Freeze daisy chained off a Joyo "isolated" (not sure if it really is or not) PS. No hum, no noises.