Most other keyboard manufacturers make OS bugfixes and additions to basic spec a mere increase in decimal point... in other words, OS 1.0, 1.1, 1.2, etc..

You generally don't get increases in basic OS number until something brand new is introduced. I don't see upgrades to add in basic functionality that should have been in since OS 1.0 as deserving of a whole new OS number, personally...

Ketron is about to release OS 1.4 CALLING it OS 4.0 don't mean squat...!