Tone Print LEDS on adjacent pedals.
I noticed that when I beamed in a tone print on the Helix, I saw the light on the pedal next to it (Viscous) also blinked and changed colors. This happened also on FB2 and T2. My chain is ALL TC Electronic. The tone prints transferred OK, and the secondary blinker pedal did not change its tone print, so it might be much ado about nothing.
Source: http://forum.tcelectronic.com