Please explain what the code does line by line and answer ALL questions completely and explain each answer for verification! thanks!

The fundamental element in music is the note or tone of an oscillation. Combination of notes is called a cord. Middle A is at 440 Hz. There are 12 notes per octave. Frequency ratio of two consecutive notes isV2 To synthesize music properly, one has to mimic the analog or continuous sound that is played by an instrument. When a note plays, it does not play as a pure sinusoid. The following graphs show how the note is played Attack Target Decay Target Release Target Figure 2: Classic ADSR envelope Attack Time