// This plays the music backwards.
#include "h.h"
BP bp; note * mus = 0;
int main(){note* music = Read("", &bp);
int last = 0; // The latest time time.
// Determine end of last note.
{void fed(note n){if(n.dur < maxdur)
  {int end = n.start+n.dur; if(last < end) last = end;}}  
scan(fed, music, 0);}
{void fed(note n) {
  note k = n;
// Leave Program changes where they are.
// Other status byte probably don't make sense.
  if(k.dur<maxdur) k.start = last - (n.start+n.dur);
  aug(k, &mus);}
scan(fed, music, 1);}
Write("", mus, &bp); return 0;}