I try to build a simple alternative chord track use one small plugin
1. Create track (midi send track) ,put some chord midi items on
track ,add EVERY item a plugin call
midiForceToKey (Insert Piz Here),set midiForceToKey note on and off
you want.So you can use chord out of scale (ex.borrowed chord).or create
another send track for scale.
2. Create instrument track and receive midi from midi send track (also can
put arpeggiator vst for track ) .
3. You can apply take FX as new take (midi out) from midi send track
You can easy edit or move midi send track .
Piz midi 64 bit :
https://code.google.com/archive/p/pizmidi/downloads