Bach, Violin Sonata No. 1, IV. PrestoLink: https://youtu.be/Ma0jX_fGHeE1. What element of music is

Bach, Violin Sonata No. 1, IV. Presto

Link: https://youtu.be/Ma0jX_fGHeE

1. What element of music is

mostly used up until about 0:50 of the piece?

What happens to the violin sound (how does it change) at 0:51 – 0:53?

3. What two elements of music change from 2:27 – 2:33?