What do you mean by "entering and exiting tabs"?
You can have 1 Unison plug-in and 4 inserts per track/channel in Console.
Remember, each input is limited to using the DSP of 1 SHARC core. With active DSP coupling you can use two DSP cores but that's it.
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I have 3 apollo x6 cards + 1 apollo X4,
example I would like to create a vocal channel with more than 4 inserts
then enter the CH1 of the first board with a microphone send the analog output CH1-2,
then re-enter CH1-2 of the second card, exit CH1-2 again
and eventually return to the third and then the fourth tab....
in this way my audio stream would be processed by 4 sound cards with a total of 16 inserts... with acceptable latency....