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I think visualizing practicing the scales would certainly be an interesting thing to try. I’m also wondering though – are you essentially saying that in order to play the scale, you need to actively think about what your fingers need to do?
If so, that would seem to be an indication that the scales/arpeggios aren’t learned well enough that they’ve reached the autonomous stage of learning. And so in a pressure situation, these skills would be more likely to fail, because the underlying habit strength (i.e. “muscle memory”) isn’t quite robust enough.
Could that be part of the issue, perhaps?
