Yo Don,
I especially like the size, weight, footprint of the Midjay Plus, that's why I am tentitive about the Audya 4 at twice the size and weight (and price). As far as keyboard gigs go, I could use a controller board. What I also do with the Korg is make sequences. I did not notice the mention of a sequencer in the Audya 4 features' list. Did I miss it in the description - Does the Audya 4 have a sequencer? If not, I would be especially hesitant about getting an A-4 although there are many other features that I would like to have. There are many more questions and I'd like to demo one in the near future.
Ciao,
Jerry