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I don't have many digital pedals, just a zoom g3 and an ehx m9. I'm pretty sure it's coming mostly from a few pedals, 2 diy pedals and a joyo voodoo fuzz. Someone on another forum suggested putting a 100r resisted in the power line, I'll try that. I posted in a few areas and barely anyone has responded. I guess I'll just have to try a little of everything. Can't hurt to have a power supply instead of endless daisy chains even if it doesn't reduce the sound much.

Hm, thanks.  I'm just going by some videos that chromesphere posted that seemed to show a similar noise being smoothed out by the regulator.  Any ideas on what you think the problem is then?

I'm having some noise issues with some pedals, some high pitched whistling. I think it's a hum issue that some regulating would fix. I don't really want to invest in an isolated power supply just yet so I looked up some possible remedies.
Chromesohere from diy guitar peds had some interesting stuff up. One was the power pellet, which was like a filter with an inductor inside. Another thing he recommended was building the regulated power supply from tonepad.

They look pretty simple, so my question is, are they pretty similar to the types of circuits used in those cheap chinese power supplies? I know they're not the same as a real iso supply but they do have some stuff in the guts to help with filtering.  Can someone who knows more about this stuff let me know if it's worth the effort to build my own. If it's basically the same as these other supplies, I'd rather just buy a cheap one for 20 or 40 bucks and save the hassle and spend my time on more pedal builds.
Here are a couple gut shots I found of some power supplies along with a very layout of the power pellet. I'd probably build the pellet first since I'm pretty new and not comfortable with the power supply layouts I've found. https://m.imgur.com/a/KRpVo