just to follow up, i was able to get the Full Color LED eyes working.
i bought servo extension leads with Futaba J connectors. some 1/4W resistors, and 5mm RGB common cathode diffused LEDs.
i pulled each pin out of the Futaba connectors and reordered them so all 8 wires lay in a ribbon format for better routing, like [RG(BC)][(CR)GB] (left and right eyes). these went into the PIO slots 1 - 6, respectively. i only had to connect the common cathode lead to one connector each (in my case, the ground of PIO 3 and 4)(1, 2, 5, 6 only have one wire, no ground).
the LEDs have minimal voltage requirements, so i used 180 ohm for Green and Blue, and 330 ohm for Red. 330 ohm is slightly lower than the minimal voltage but it worked. I may try to increase resistance because the LED is too bright, even though they are diffused.
I used 26AWG servo leads, but maybe 32AWG would be better.
now i have multi-color eyes that can be controlled independently.
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