Feedback from the instrument
When a saxophone player tries several saxophones to see which one is best, the people listening cannot hear a difference, but the player suddenly says "This is the one." Even if there is no difference in the acoustics of the instrument, there is much information that a person gets by playing the instrument. If the saxophonist gets a good feeling when playing the instrument, his style will gradually change, and when he is enjoyably playing the instrument, the audience will be able to perceive the difference. The saxophone will gradually change the player's timbre and tone as he continues to play because the instrument provides feedback.