@vinark: lol, we typed at the same time

1- Sorry, but RayDAT is a card with only digital inputs and outputs, like clearly described on product page
in the Box labeled "Connectivity" in the upper right

    36 Inputs / 36 Outputs
    4 x ADAT I/O (up to 192 kHz via S/MUX4)
    1 x AES/EBU I/O (192 kHz)
    1 x SPDIF I/O (192 kHZ)
    2 x MIDI I/O

For this card you need to connect via ADAT
- either an AD/DA converter to get analog INs and OUTs or
- a preamps if you require mic inputs

BTW this was the reason why I ordered my Monitors with digital AES interface to also be able to connect them to the RayDAT when the main interface should be out of the house (mobile use or shall it need repair).

2- You have 2 different MIDI channels, which each of them always consists of IN and OUT, thus together 4 Plugs in total.

I think RME provides 2 different channels here to have 1 dedicated MIDI channel for
a) connecting instruments like master keyboard
b) remote controlling their products like preamps and converters via MIDI using their "RME Midi Remote" control software

Question: did you already buy it ? You should perhaps tell your connection demands here to discuss, whether another RME interface suits your demand better.

You can also have a look at my comparison sheet upfront: https://www.tonstudio-forum.de/index.ph … 017-12-pdf

Shall you need an excellent converter, then the RayDAT can be perfectly combined with an ADI-2 Pro and ARC USB, like shown here in my blog article: https://www.tonstudio-forum.de/blog/ind … port-DE-EN

Information about the ADI-2 Pro here (sorry this one only available in german)
https://www.tonstudio-forum.de/blog/ind … %C3%A4rker