DT Videolabs InstaCue - Manual (Page 5)

Color Coding/Red - Indicates clip is in Playback.
Color Coding/Blue - Indicates clip is next in a Roll-Through.
Color Coding/Yellow - Indicates clip is either Curbing, Ramping or waiting to start from a Delay
Roll-Through.
A clip will get darker when selected.
Clip Controls continued:
InstaCue 1.1 Users Guide
Page 4