ProTools and Mojave to Monterey . . .

[kj]

I think UVI has a free version of workstation, so you could see if the AU version (rather than AAX?) works in garageband. If you bought sounds for it, you should be able to transfer those over.

I haven't used the built-in sound much, but I know I can't get as low latency as I can with my interfaces. But it's usually really solid.