VB-Audio Matrix Coconut.
The VB-Audio Matrix Coconut is an ultimate audio router
(up to 3112 x 3112 points) to connect everything together, channel by channel through up to:

7x Physical ASIO devices (up to 512 channels).
10x Physical Windows devices (up to 64 channels).
8x Virtual Windows devices (up to 8 channels).
10x VBAN Streams (up to 128 channels).
8x Virtual ASIO devices (up to 512 channels).

home page: https://vb-audio.com/Matrix/coconut.htm