The Fade-LED-Dimmer-Channel Action allows you to fade one of three channels on the 3 Channel Dimmer expansion module to a percent of 0 - 100% over a time period in seconds. Setting channel 1 will change the red display on the dimmer, setting channel 2 will change the green display on the dimmer, and setting channel 3 will change the blue display on the dimmer. If you have two 3 Channel LED Dimmer's then setting the channel to 4 would change the red display of the second dimmer, setting the channel 5 would change the green display of the second dimmer, and setting the channel to 6 would change the blue display of the second dimmer. Lastly you can set the duration it takes for the these values to fade.