Since Mudcat is a music site, here's an appropriate item:

THE BAD NOTE THEORY

This is a copy of Jim Coon's "Bad Note Theory". While it mentions the mandolin as an example, it applies to all instruments.

The more you practice, the more of the bad notes are used up.

This can be proven by correlation. Look at some of the people that have played a lot and how they sound: Dave Grissman, Neil Gladd, Sam Bush.

It comes from playing enough to get rid of the bad notes.

One caution comes to mind, I think it is one of the laws of thermodynamics: If you stop practicing, the bad
note supply tends to build back up, maybe not to the original level but they build back up.

The instrument also knows if a different person is playing it other than the one that has been using up the bad notes. In this case it calls upon its reserve of bad notes to match how much the present player has used up on another instrument.

Just remember, the more you practice, the more you deplete the supply of bad notes.