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Interesting take on it. How easy would it be to mount those other boards though? I like how compact you were able to get the EQ chip components on the board. You should check out my comment, I moved it over to a PCB board too.
I made it on a breadboard first, wiring it a few different ways to see if it reduced noise at all. In the end, i found that it didn't matter too much. I did find, however, that the issue of noise in the lights did get slightly worse once i soldered it to the PCB. Not noticeable while music plays, but you can notice when music is quiet or completely off, which bugs me. I've played with the filter in the code and it doesn't seem to help all that much. Either way, I'm glad with how it turned out and plan on making a light diffusion box in order to use it as stage lighting.Heres some videos of it working