Yep... I use the built-in MIDI 'capture' on my arranger to get down what I actually PLAY. But then, when it comes time to edit, polish, substitute, and anything else my imagination feels like, it gets transferred to the computer, and the polish is done there.

I gave up on built-in sequencers decades ago...
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An arranger is just a tool. What matters is what you build with it..!