## 2.5 手動変換

しかしながら、LilyPond プロジェクトの資源には限りがあり、すべての変換を自動化することはできません。以下は既知の問題のリストです。

```1.6->2.0:
Doesn't always convert figured bass correctly, specifically things like {<
>}.  Mats' comment on working around this:
To be able to run convert-ly
on it, I first replaced all occurrences of '{<' to some dummy like '{#'
and similarly I replaced '>}' with '&}'.  After the conversion, I could
then change back from '{ #' to '{ <' and from '& }' to '> }'.
Doesn't convert all text markup correctly.  In the old markup syntax,
it was possible to group a number of markup commands together within
parentheses, e.g.
-#'((bold italic) "string")
This will incorrectly be converted into
-\markup{{\bold italic} "string"}
-\markup{\bold \italic "string"}
2.0->2.2:
Doesn't handle \partcombine
Doesn't do \addlyrics => \lyricsto, this breaks some scores with multiple
stanzas.
2.0->2.4:
\magnify isn't changed to \fontsize.
- \magnify #m => \fontsize #f, where f = 6ln(m)/ln(2)
remove-tag isn't changed.
- \applyMusic #(remove-tag '. . .) => \keepWithTag #'. . .
first-page-number isn't changed.
- first-page-number no => print-first-page-number = ##f
Line breaks in header strings aren't converted.
- \\\\  as line break in \header strings => \markup \center-align <
"First Line" "Second Line" >
Crescendo and decrescendo terminators aren't converted.
- \rced => \!
- \rc => \!
2.2->2.4:
\turnOff (used in \set Staff.VoltaBracket = \turnOff) is not properly
converted.
2.4.2->2.5.9
\markup{ \center-align <{ ... }> } should be converted to:
\markup{ \center-align {\line { ... }} }
but now, \line is missing.
2.4->2.6
Special LaTeX characters such as \$~\$ in text are not converted to UTF8.
2.8
\score{} must now begin with a music expression.  Anything else
(particularly \header{}) must come after the music.
```

### 脚注

[1] At least, this is possible in any LilyPond file which does not contain scheme. If there is scheme in the file, then the LilyPond file contains a Turing-complete language, and we run into problems with the famous “Halting Problem” in computer science.