I honestly think you already have the perfect 76… it is extremely lightweight but well built, has a great feeling action (which none of those cheaper keyboards do🤮) and draws VERY little current (no big bright color touchscreens to drain the battery pack). Why get anything different?
One thing you need to consider… Time.
Multiple keyboards needs much time and effort to learn, and if you wish to perform the same songs on both, that’s double the time spent programming. Stick to one keyboard, you half the time spent NOT playing. You have the same setup and songlist no matter where you go. You need not worry about ‘How do I do this on this keyboard?’ in the middle of a gig. You only have one set of backups to worry about. And you sound consistently good, whether round a campfire or in a restaurant, bar or nightclub.
I see all too many people basically overwhelm themselves constantly trying different arrangers, and ending up not knowing 10% of any of them. Stick to one, when you want something ‘different’, try reprogramming the styles to use new sounds, get a hold of conversions from Korg or Yamaha and tweak them to your taste, spend an hour trying different lead sounds, experiment with the MFX and the controls to create something new.
Soon enough, rather than knowing 10% about two or three keyboards, you know 99% about one (no one EVER knows 100%!), and you will be far more productive.
At the end of the day, it is playing MUSIC that matters. Wasting half your available time duplicating your efforts on another keyboard is time wasted. Stick to one keyboard, concentrate on the music!
I have generally had each of my Roland arrangers for at least ten years (G1000, G70, BK-9) while many others go through two or three in the same time frame I use one! Guess who knows their keyboard better? 🤔🎹😎
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An arranger is just a tool. What matters is what you build with it..!