If there were no lacking features in the PSR 9000 then there should never have been a T1, T2, T3, and T4.
Yamaha thinks different from you in that they do not think a lot of persons are using their older arranger. If they did they would not be making so many new arrangers.
Look Ian you may not agree with Yamaha�s way of business but that is what has been working for them and other manufacturers should follow if they want to stay in the TOTL arranger business.
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TTG