Action - Variable - Feedback for toggle Flying Key on off

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Please add Action - Variable - Feedback for toggle Flying Key on off for Upstream Keys.

Flying Key On / OFF is an important setting for Upstream Keys. ON means the Flying Key settings such as Size, Position X-Y is applied to the Key. If it is ON and the key is on air and/or selected for the Next Transition it uses a DVE channel. (Also the DVE / LOGO Transition Type uses a DVE channel).

An ATEM switcher may have 1, 2 or 4 DVE channels. If the available number of DVE channels are in use it means that you cannot set Flying Key on for Key which does not use a DVE channel yet. Same for the KEY Transition selection button and the On Air button.

It is also important that Companion is in sync with the Flying Key On / Off setting (so one can determine the number of DVE channels in use).

Example for 2 M/E Constellation. Maximum number of DVE channels is 2. M/E 1 KEY 1 Key Type is LUMA and Flying Key is on. Key is On Air M/E 2 KEY1 Key Type is LUMA and Flying Key is on. Key 1 is On Air All DVE channels are in use. You cannot set any other Key to DVE and in Transition / On Air. Also transition type DVE cannot be used. Want to grey out the buttons which cannot be used.