In reply to:

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think that would be too bright compared to the buttons. As it is now, when I went from three to four, the knob is already starting to look unusually bright compared to the buttons

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The solution to the brightness problem as I mentioned earlier, is to increase the resistance limiting the current to the LEDs. Currently it is 100 ohms I think. If you increase the resistance, you cut the current and brightness. Doing so can keep the relative brightness in check.

Stu