WASAPI audio driver more than 2 channels and Linux no ALSA?

General
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1

By using the Decklink audio feature for de-embedding and embedding I can run low latency audio parallel with CasparCG, using Ardour.
But so far I have found some limits on the Decklink audio driver
I can embed channel 1+2 on Windows 10 with the WASAPI driver, but I can´t get acces to channel 3-16. And can´t get the line-in drivers (de-embedder) to work unless I´m running Media Express in record mode.
On Ubuntu 18.04 i don´t have any audio drivers at all.

Has anyone here experience with the Audio drivers on the Decklink cards?
Tips, tricks, weak point etc.

2

Update: De-embedding of channel 1+2 on videoinputs works on Windows 10. But the decklink video input must be activated in CasparCG or in another program first.