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<a name="Skipping-corrected-music"></a>
Previous: <a rel="previous" accesskey="p" href="Extracting-fragments-of-music.es.html#Extracting-fragments-of-music">Extracting fragments of music</a>,
Up: <a rel="up" accesskey="u" href="Controlling-output.es.html#Controlling-output">Controlling output</a>
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<h4 class="subsection">3.4.2 Skipping corrected music</h4>
<p><a name="index-skipTypesetting-2436"></a><a name="index-skipTypesetting-2437"></a>
<a name="index-showLastLength-2438"></a><a name="index-showLastLength-2439"></a>
<p>When entering or copying music, usually only the music near the end (where
you
are adding notes) is interesting to view and correct. To speed up
this correction process, it is possible to skip typesetting of all but
the last few measures. This is achieved by putting
<pre class="verbatim">
showLastLength = R1*5
\score { ... }
</pre>
<p class="noindent">in your source file. This will render only the last 5 measures
(assuming 4/4 time signature) of every <code>\score</code> in the input
file. For longer pieces, rendering only a small part is often an order
of magnitude quicker than rendering it completely
<p>Skipping parts of a score can be controlled in a more fine-grained
fashion with the property <code>Score.skipTypesetting</code>. When it is
set, no typesetting is performed at all.
<p>This property is also used to control output to the MIDI file. Note that
it skips all events, including tempo and instrument changes. You have
been warned.
<blockquote>
<pre class="verbatim">
\relative c'' {
c8 d
\set Score.skipTypesetting = ##t
e e e e e e e e
\set Score.skipTypesetting = ##f
c d b bes a g c2 }
</pre>
<p>
<a href="../d5/lily-8ba39632.ly">
<img align="middle"
border="0" src="../d5/lily-8ba39632.png" alt="[image of music]">
</a>
</p>
</blockquote>
<p>In polyphonic music, <code>Score.skipTypesetting</code> will affect all
voices and staves, saving even more time.
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Previous: <a rel="previous" accesskey="p" href="Extracting-fragments-of-music.es.html#Extracting-fragments-of-music">Extracting fragments of music</a>,
Up: <a rel="up" accesskey="u" href="Controlling-output.es.html#Controlling-output">Controlling output</a>
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