#!/bin/bash

cnt=$(
  cat
)

printf '%s\n' "${cnt}" \
| sed "$(
  printf '%s\n' "${cnt}" \
  | sed -n '
    s/^.*%ERICH-HINWEIS: \([^0-9]\+\)\([0-9]*\) != \(.\+\)%.*$/\1 duration \2 != \3/
    T
    =
    p
  ' \
  | sed '
    N
    s/^\([0-9]\+\)\n\([^0-9]\+\) duration \([0-9]*\) != \(.*\)$/\1 s@\2\3@<\2 \\\\tweak NoteHead.style #'"'"'cross \4 >\3@g/
  '
)"