Perhaps it's time, after all the hoopla about the T5 76 being so popular, for Korg and Yamaha to join with Roland, and produce an affordable MOTL 76? Roland have already shown it can be done without a weight penalty...

A PSR9x0 76, with a better action, and a PA900/76 would probably sell pretty well if the T5/76's success is anything to go by...
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An arranger is just a tool. What matters is what you build with it..!