This mede me think about this and I would probably say that the number one sign of the amateur string player (who otherwise can have good intonation and such) is the inability to control properly the amount of weight/pressure applied to the bow in phrases with unequal note values and bowings.
What do you think?
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Undesired accents in notes of the same value that require more bow.
Say 4 quarter notes of the 3:1 bow length kind.
Do you have much experience with electric violins?
There is what is called carryover. Like inertia in physics, there is a limit. Is the movement fast? So is the heart and blood and the next adagio won't settle down until the 8th measure or more. Professionals still have to deal with this, not just amateurs. There are some concertos that require many transitions, every 2 or 4 measures. Imagination of the drama can help.
Furthermore, there are many highly skilled amateur players. To put out a blanket statement implying that all amateurs have poor bow handling skills is not accurate and unfair.
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