keyer was made by Graham-Patten Systems. It is 19" rackmountable.
Front controls are as follows:
- External/Norm/Bord/Shdw/Outline selection
- Switches for White Bord, Key Inv, and Matte
- Lum, Hue, Sat, Gain, and Clip Adjustments
- Key and Black pushbutton controls
- Key Rate and Black Rate counters
Rear connections are pictured below.