The raw materials of music realized by single chip microcomputer are very simple. The symbols in music are arranged in a table in sequence, and then the music to be played is edited according to the table, and then the table lookup program takes it out in turn to generate notes and control the rhythm.

Generally speaking, the ending character is ff, and the body stop character is .

x is the prefix of hexadecimal digit notation.

You can see how your shrapnel machine program defines it.