What you’re seeing is MIDI clock, which is sent 24 times per quarter note. The Karma sends this in all modes (except Disk mode) whether KARMA is on or off. The only way to stop this is to put the Karma in External Sync Mode (and then of course, nothing will work unless you send it MIDI Clock from somewhere else). This activity is actually harmless, and is in no danger of “clogging” your interface. This will keep the light activated, but it is not at all a “flood” of information; just a steady pulse that in no way causes any problems. But one idea if this really bothers you: in OMS, for example, which is
what I use on my Mac, you can specify whether a certain instrument sends/receives MIDI Clock. You may be using FreeMIDI or something else, which I am not familiar with. But if you have that sort of feature, and you don’t need to sync anything to the Karma, you can just “filter out” the MIDI Clock from the Karma. Many interfaces have internal
options you can set to do this, also.