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You build up calluses, although I don't play as much as I should.

I didn't hear any mistakes this time, I used to improvise when I played keyboards. Similar I guess?

Just have to stick around the scale and you can't go far wrong. With some other jams I was not even sure what scale to use. I need to study this stuff more. There is a logic to it, but it takes time to get it and make it sound good.