I gave it another try this morning after updating to last reaper to 5,961 + dev 1112/64.
It now works as expected !
The modulation wheel controler assigned to Tyrell N6 now moved according to the envelope segment triggered.
That's a usefull tool for adding expression and evolving sounds.
Great job.
Note : if midi output is set to all, the envelope is laggy. I set to channel 1 as your advice.
https://drive.google.com/open?id=1Bx...418U1H2ExKVhAH