I realized I'd not installed my midi interfaces so I went to M-audio's site to check. The latest available driver is

MIDI USB Driver v3.5.3 (MAC)

- released in the fantastic year... 2009!

Of course it doesn't support macOS Catalina - in fact it's not possible to run through the installer at all.

I'm sitting here with two big Midisport interfaces (4 x 4 and the 8 x 8) -

Please tell me that someone wrote a driver for these as they're not even lighting up when connected.

It would be possible for me to use them on an older machine but then I can't use Logic Pro X which is what I want to do this time.

Any insightful helpful ideas?