I'm not a pianist, although 76 has given me greater inspiration to explore more. Maybe I'm crazy, but I really believe the extra 15 keys give more 'body' to the overall sound - but no expert in this area smile JMO
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)