It’s funny how things change! Years ago, when Yamaha didn’t make a 76 no matter the cost, I couldn’t get a Yamaha player to admit a 76 was needed. Now they don’t make a 61 TOTL no matter the cost, magically the 76 is quite happily accepted...

Perhaps the next step is a 76 SX series, now that the advantages of those extra keys is being willing to be admitted! I for one would quite welcome a 76 SX900. As I really like playing piano parts with both hands, the extra octave or so makes all the difference..!
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An arranger is just a tool. What matters is what you build with it..!