This “Append” patch is only of interest if you are creating or adapting a physical-loopback patch
When you want to use a CC/note coming from a loopback as a *mapping* event, a problem arises:
any event you sent into the loop will get auto-mapped first!
This utility solves the problem by sending the required CC/note on the required channel independently of any input.
Append it to your loopback patch, set all your mappings and remove
PS. Naturally, a physical MIDI/USB loopback needed for this to work. The stray LOOPBACK-IN is included for (un-scary) testing – map one it’s two properties and watch it enable/disable | switch MIDI-A/Virtual-H