“Analog man in a digital world”....Love it! LOL
The second movement is in 3/4, B-flat, and is marked adagio, at rest. This movement has a hint of bel canto opera. He adds drum roll figures in the left and then the right hands. It has an air of improvisation.
The finale in D minor, 3/8 and marked allegretto is the heart of the sonata and the movement from which it gets its name. Having had a sonata movement at the beginning with only one subject, Lou writes a movement in full sonata format.
At 20:43, he begins his development and concentrates only on the first subject.
At 22:26, he recaps and brings his second subject back in D minor, which is what you would expect. He builds his coda from the first subject and ends quietly.