“Of course, some of the owners of older Yamaha arrangers will eventually upgrade to a new one, sometimes that will depend on how long they've had the instrument, any changes in their needs, and sometimes just for some new sounds and a taste of newer technology...”
Double talk?

Still does not solve the issues of there having to be a T1 T2 T3 T4.

Ian I guess I will have to leave you by your self to talk in circles.