2. Video Source Buses

Each panel row has three buses of video source buttons (Keyer, Background, and Preset). When the panel row is assigned to an ME each bus of buttons is assigned to a video bus. If the panel row is assigned to a chroma key or aux bus, the key bus row is assigned to that video bus while the background and preset buses remain assigned to the previous buses.

The mnemonic displays show the video sources that are assigned to the buttons on the keyer row and background/preset row.