It is a bit of necroposting, but I’ve bumped into the same issue - some notes are stuck sometimes from my midi controller as NoteOn, and enabling-disabling a corresponding plugin is not a feasible method if you do not have access to Webui when this happens, and even you have access - it takes quite a lot of badly spent time with an annoying sound in background, while searching for the plugin if pedalboard is large enough like this:
However, looks like sending CC123 works fine. You can emulate MIDI PANIC by sending this signal with Infamous mindi, connecting it to each generator that requires midi panic:
I’ve checked it with the following generators, and seems like they all stop playing when they get this CC123:
amsynth
tal noisemaker
dx10
airfont320
fluidgm organs
There are other generators I did not test, so I cannot say if they all respect this CC, but that’s quite a number to prove the concept.
For sure this mindi can be assigned to a button, so you can use it without webui.