Tweakie
I had discovered since posting that the plugin will operate via Digital Trigger active high.
Funny thing is, I had been using the plugin via Output1 active low. This worked fine and I had been engraving the last couple of days that way. As soon as I set it to active high it no longer worked. Go figure.
Anyway I am now happily using Digital Trigger. Engraving results are steadily improving as I try more variations. Need some better material for testing.
Greolt