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SECTION 14.3 KEY CHANNELS
The Key channels in M/E panes match the DSK channels found in the Switcher’s main Transition section in almost all respects.
Unlike the DSKs, though, they constitute a ‘pre-Switcher’ sub- layer. This means that Key channels are applied before the composition is sent to the Switcher (or another M/E). Content in a Key channel appears beneath anything displayed via the (Switcher) DSK channels.
Key channel selection and Position controls work just like their DSK cousins, discussed earlier (see 9.3.1), the sole distinction being that their behavior in connection with Autoplay mimics other M/E sources.