Grass Valley Kayak HD v.6.9.3 - Manual (Page 247)

Kayak — User Manual 247
DPM Menus
In the Key – Priority – Misc menu you can switch on DPM effect loop for
the chosen keyers (Loop On) and select the flipside of an effect (Use Src).
This information is not part of a DPM effect and should be set manually or
recalled by an E-MEM recall (like the keyer parameter settings).
Figure 168. Key Selection for DPM Channels