Tony,
For the most part, the most increase has been in those upgrading current AUDYAs with the AJAMSONIC upgrade kit here and oversease in UK, Germany, AUS, France ... etc. Ever since we made it possible for the end-user to now install this without having to ship the keyboard to us, we've been doing pretty well. Feedback (and from many who reside on this forum as well) speaks volumes ... in many cases even mentions what we either didn't do a good job doing, or in words better than ours could - and for that, we are thankful and greatful and happy to have put out a product that they and other end-users helped initiate and are now enjoying.
The next increase in sales here in th US but especially in EU and AUS has been of those purchasing AUDYAS with the AJAMSONIC upgrade already installed. With the new VCE-2 Voice Articulations, even converted styles from other manufactureres now sounds more decent on these AUDYA products. If all goes well, we are hopeful to include a conversion program with future updates which will be able to properly map Mega, SA and RX voices to equivalent VCE-1 and VCE-2 KETRON AUDYA voices for styles converted from other manufacturers .... that's up the pipes but it's being looked into as current conversion programs are obsolete (they do not account well for the new technology [sample switching, voice crossfading ...etc] being used in current modern Arranger keyboards).
Hope you have a Merry Christmas and a Prosperous New Year 2013 (while we stay at work with the intent to bring our customers even more in 2013).
The New "LIVE Grand Piano" soon to be released should put a smile on faces.