Import 5.5x settings to 6?

I’ve searched the forum and must be missing something.

I was able to find the thread on moving a custom key-command list from 5.5’s prefs and re-import to 6. That worked, and thanks.

Now… how do I move all my Device Panel settings?

I’ve got an MCU with custom buttons… do I have to rebuild all of those from the pulldown menus?
Ditto MOTU 2408 channel setups…

Where did 5.5 store these, and can I move the file to 6.x?