In the Komplete Kontrol 1.9.1 manual there is an ! in the upper right of the plugin, similar to Kontakt. This "panic button" stops all active MIDI notes and noises.
This appears to be missing in 2.9.6.
I cannot upgrade to 3.x due to a compatibility bug (with Reaper) I'm waiting to be fixed by NI. So, I don't know if its in that version…
Is there still a panic button?
And more importantly, is there any way to keybind this to something physical like the Stop button on the keyboards or a button on my laptop keyboard? I can't access the ! in Kontact within Komplete Kontrol very easily and I have occasional issues with stuck MIDI notes when I'm bypassing the plugin in my DAW.