Hi everyone, Thanks to Matt9 sharing the hack and following Tyronet's invaluable detailed instructions, I managed to reconnect my old Mackie Onyx 820i mixer to my MacBook Pro (16-inch, 2021, M1 Max) running Sequia 15.6, and it seems to work perfectly with Logic Pro 11.2.2. (I'm using an FW400-FW800 cable + an Apple Thunderbolt-FW800 adapter + an Apple Thunderbolt3 USB-C-Thunderbolt2 adapter.) Thanks to everyone, but shame on Apple for putting us in this terrible situation!