Itās a bit fiddly, and I have a feeling the individual temperaments of midi gear might make a difference here.
When Iāve used the Deluge as a sequencer to record audio into the Blackbox, Iāve had to manually arm the Blackbox (as in keeping Record pressed) and then start the Deluge sequencer, and then it works. For my purpose, itās just a theoretical inconvenience. But in a more complex rig, I would imagine this kind of behaviour isnāt great. This is one area where the Octatrack, for example, is superior - arming, triggering recording, that kind of stuff.
Midi in general works fine, though. Playing it from a keyboard, having it send thru messages, all works fine. CC is what it is, many of the parameters canāt be tweaked but itās clear from the interface which can and canāt be.