Hi Gary,

assuming you only want the OS 4.2 upgrade, this should be in the form of download from Ketron, which you will unzip and install on a memory stick, follow the instructions, and will be updated to new OS without the extra styles etc.

If you wish you can wait for the upgrade memory stick from Ketron which will include the OS Update along with all of the new Ketron Styles and so on.

Aj's update is a separate upgrade and will not apparently interfere with the previous updates.

So if you want new styles sounds, then it's user pays, same as Yamaha, however without these Audya is still the best sounding in my opinion.