I had Astra make a digital violin with a physics engine. It has to make music by pulling the bow across the string and forming the finger positioning for arpeggios, the same way a human would. If the motion is wrong, it sounds badly (trust me I tried it). It played Bach.
Summary
A user employed Astra to develop a digital violin with a physics engine that replicates human bowing and fingering techniques to perform Bach's Prelude, BWV 1007.
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