Actually using the DISPLAY_TIME to delay the colors. #7
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The DISPLAY_TIME in circuit #3 is not used, even though it is mentioned in the comments (I guess it should be either deleted or used).
I also made a variation of the sample to use the potentiometer to manage the DELAY_TIME, and also to use a bitwise-based RGB function to improve the way the spectrum if shown.
You can see it here: josea@7fc2018