My, what big hand you have;
I, too, have watched this movie with a fair length of time between each screening. In the Trivia section, it was stated that Joshua Bell would finger all the notes on the violin by standing behind the person. For this, he was called the stunt violinist. I happened to notice the close up shot of Kaspar when he is very young. This big old giant left hand shoots out and is doing the fingering.
It's worth a look. Don't have to watch the whole movie; the snippet is very short. It's the last performance at the orphanage.
Here lies Lester Moore. Four slugs from a .44. No e, no more.