While I still have you here, and because you may not be available to communicate further when I try to test out whatever it was with the keyboard, I just want to clarify. The idea is to press play in Reaper (after I run the script we've been going over), and it will jam in key along with the chord changes?

Is there another step before we get there, as in a another script I need to run that will input MIDI chords in Reaper as you demonstrated in the UJAM bass piano and keys video?

Band-in-a-Box 2024. Custom Build Desktop PC W/ Windows 10 Home 64-bit. CPU: Intel Core i5-9600k @ 3.7GHz (6 core x 6 threads) RAM: 16GB DDR4. Storage 238GB SSD + 2.7 TB HDD. GPU: ZOTAC NVIDIA GeForce GTX 1050 Ti 4GB