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If it's not the tremolo, remove each pedal one st a time till it goes.
If it still doesn't go then maybe it's something else in the house or outdide causing interference. One time someone on here was picking up a pulse from a nearby electric fence iirc.
If not it could actually be something else interacting via the power supply, if the outputs aren't isolated. (Which I agree it doesn't look like they are.)
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
It seems like the PSU is split into A & B and Other, each block is isolated, but not the individual outputs within the blocks, this might be an issue.
If it still doesn't work, all you can do is add pedals 1x1 to the chain until the noise appears.
In that case you need to add pedals one by one until the noise occurs, then take the others (ie not the one you just added) away one by one until it stops.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
if this throws up the rogue, maybe search online for others who have had a similar problem with that effect. sometimes there will be a little trimpot inside that will allow you to tune ghost lfo whooshing out, which would be a simple and painless diy fix.
if it's a badly designed pedal, or a vintage pedal that was designed before people could be as fussy about true bypass as they are now (EHX modulations sometimes like this), it may be something you will have to swap for something else or live with.
if it is causing probs but you really want to keep it, think about isolating it from your main pedalboard signal chain by putting it in a little a/ switchable loop of its own. so it is only bleeding through when you absolutely need it, and when you don't, it is removed from your main chain altogether.
you can get a tiny box a/b switch v cheap and won't take up much room.
Pretty sure what you are describing is clock noise on the power supply. Cheap power supplies that aren’t properly isolated will do this.
Try powering the digital pedals using their original or separate power supplies and powering the rest of the board as normal as an experiment.