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spurgurgle why would you add a resistor when a potentiometer is a resistor (a variable one).
i dont really know but i might be beacause of the red in the led requirering less forward voltage........try getting a red and blue and a green led wire them blue and green up to a power supply.... then add the red on... the blue and green will get dim... unless u resistor the red down by about 100ohm's