Deane I checked out your videos of the V-arranger with the A-800Pro controller...I noticed you set up start/ stop and endings on the pads...Did you ever set up a more detailed controller to use with V-arranger?..
BTW: I think I liked the V-arranger slightly better for sound..It did sound like the SD2...right?
If Dan is reading this...Does the V-arranger program allow for easy controller set up....maybe a midi learn tab to match parameter with controller utility (knob, sliders etc).
If the V-arranger could be set up to make good use of the Roland A-800 pro...and also allow VST's arranged within the program..
A softsynth version or the Ketron SD series, and better yet a Roland BK sound set...
This would allow for a great sounding and flexible soundset..and if all control was assignable to the A-800 pro...it would be an easy set up...