unable to update touch fader leds on Base 1

Hi, I have a Base 1 and put together a Live user remote script for device control with the touch faders.  The faders now control device parameters ok, but the leds don't respond to incoming MIDI messages.  Sending MIDI manually using Max or the Livid editor, I can update the colors of the drum pads for example, but when I send CCs to the faders I get no led feedback.  Anyone know why that might be?  I've tried enabling and disabling local control for the faders, but it makes no difference.