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	<id>https://wiki.lilypond.community/index.php?action=history&amp;feed=atom&amp;title=Tuning_the_MIDI_output_in_Hertz</id>
	<title>Tuning the MIDI output in Hertz - Revision history</title>
	<link rel="self" type="application/atom+xml" href="https://wiki.lilypond.community/index.php?action=history&amp;feed=atom&amp;title=Tuning_the_MIDI_output_in_Hertz"/>
	<link rel="alternate" type="text/html" href="https://wiki.lilypond.community/index.php?title=Tuning_the_MIDI_output_in_Hertz&amp;action=history"/>
	<updated>2026-05-14T00:10:27Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
	<generator>MediaWiki 1.44.2</generator>
	<entry>
		<id>https://wiki.lilypond.community/index.php?title=Tuning_the_MIDI_output_in_Hertz&amp;diff=4919&amp;oldid=prev</id>
		<title>Lemzwerg: New category</title>
		<link rel="alternate" type="text/html" href="https://wiki.lilypond.community/index.php?title=Tuning_the_MIDI_output_in_Hertz&amp;diff=4919&amp;oldid=prev"/>
		<updated>2025-11-21T23:36:08Z</updated>

		<summary type="html">&lt;p&gt;New category&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 23:36, 21 November 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l26&quot;&gt;Line 26:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 26:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Pitches]]&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Pitches]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Pitches]]&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Pitches]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Midi]][[Category:Snippet]]&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Midi]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Snippet]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Lemzwerg</name></author>
	</entry>
	<entry>
		<id>https://wiki.lilypond.community/index.php?title=Tuning_the_MIDI_output_in_Hertz&amp;diff=3965&amp;oldid=prev</id>
		<title>Lemzwerg at 23:01, 21 November 2025</title>
		<link rel="alternate" type="text/html" href="https://wiki.lilypond.community/index.php?title=Tuning_the_MIDI_output_in_Hertz&amp;diff=3965&amp;oldid=prev"/>
		<updated>2025-11-21T23:01:53Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
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				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 23:01, 21 November 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l26&quot;&gt;Line 26:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 26:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Pitches]]&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Pitches]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Pitches]]&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Pitches]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Midi]]&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Category:Midi&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;]][[Category:Snippet&lt;/ins&gt;]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Lemzwerg</name></author>
	</entry>
	<entry>
		<id>https://wiki.lilypond.community/index.php?title=Tuning_the_MIDI_output_in_Hertz&amp;diff=2540&amp;oldid=prev</id>
		<title>Jean Abou Samra: Replace version=&quot;2.24.0&quot; with version=&quot;2.24&quot; now that the LilyWiki extension supports auto-selecting the latest release in a stable series</title>
		<link rel="alternate" type="text/html" href="https://wiki.lilypond.community/index.php?title=Tuning_the_MIDI_output_in_Hertz&amp;diff=2540&amp;oldid=prev"/>
		<updated>2025-11-16T18:52:31Z</updated>

		<summary type="html">&lt;p&gt;Replace version=&amp;quot;2.24.0&amp;quot; with version=&amp;quot;2.24&amp;quot; now that the LilyWiki extension supports auto-selecting the latest release in a stable series&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 18:52, 16 November 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l1&quot;&gt;Line 1:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 1:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;This snippet can be used to tune the MIDI output so that the A has an arbitrary frequency expressed in Hertz. For example, 440 Hz is the most common tuning, and 415 Hz is a typical baroque tuning.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;This snippet can be used to tune the MIDI output so that the A has an arbitrary frequency expressed in Hertz. For example, 440 Hz is the most common tuning, and 415 Hz is a typical baroque tuning.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;lilypond version=&quot;2.24&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;.0&lt;/del&gt;&quot;&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;lilypond version=&quot;2.24&quot;&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;%% https://lilypond.community/t/diapason-midi/5559&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;%% https://lilypond.community/t/diapason-midi/5559&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Jean Abou Samra</name></author>
	</entry>
	<entry>
		<id>https://wiki.lilypond.community/index.php?title=Tuning_the_MIDI_output_in_Hertz&amp;diff=2026&amp;oldid=prev</id>
		<title>Rudi Guggt: Rudi Guggt moved page Tuning the MIDI output in Herz to Tuning the MIDI output in Hertz: Misspelled title</title>
		<link rel="alternate" type="text/html" href="https://wiki.lilypond.community/index.php?title=Tuning_the_MIDI_output_in_Hertz&amp;diff=2026&amp;oldid=prev"/>
		<updated>2025-11-11T09:21:14Z</updated>

		<summary type="html">&lt;p&gt;Rudi Guggt moved page &lt;a href=&quot;/index.php?title=Tuning_the_MIDI_output_in_Herz&amp;amp;action=edit&amp;amp;redlink=1&quot; class=&quot;new&quot; title=&quot;Tuning the MIDI output in Herz (page does not exist)&quot;&gt;Tuning the MIDI output in Herz&lt;/a&gt; to &lt;a href=&quot;/wiki/Tuning_the_MIDI_output_in_Hertz&quot; title=&quot;Tuning the MIDI output in Hertz&quot;&gt;Tuning the MIDI output in Hertz&lt;/a&gt;: Misspelled title&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;1&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;1&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 09:21, 11 November 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-notice&quot; lang=&quot;en&quot;&gt;&lt;div class=&quot;mw-diff-empty&quot;&gt;(No difference)&lt;/div&gt;
&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</summary>
		<author><name>Rudi Guggt</name></author>
	</entry>
	<entry>
		<id>https://wiki.lilypond.community/index.php?title=Tuning_the_MIDI_output_in_Hertz&amp;diff=777&amp;oldid=prev</id>
		<title>Jean Abou Samra: Import snippet from LSR</title>
		<link rel="alternate" type="text/html" href="https://wiki.lilypond.community/index.php?title=Tuning_the_MIDI_output_in_Hertz&amp;diff=777&amp;oldid=prev"/>
		<updated>2025-10-26T22:47:50Z</updated>

		<summary type="html">&lt;p&gt;Import snippet from LSR&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;This snippet can be used to tune the MIDI output so that the A has an arbitrary frequency expressed in Hertz. For example, 440 Hz is the most common tuning, and 415 Hz is a typical baroque tuning.&lt;br /&gt;
&lt;br /&gt;
&amp;lt;lilypond version=&amp;quot;2.24.0&amp;quot;&amp;gt;&lt;br /&gt;
%% https://lilypond.community/t/diapason-midi/5559&lt;br /&gt;
&lt;br /&gt;
hertzTuning =&lt;br /&gt;
#(define-music-function (freq) (number?)&lt;br /&gt;
   (let* ((freq-factor (/ freq 440))&lt;br /&gt;
          (tone-factor (expt 2 1/6))&lt;br /&gt;
          (diff (/ (log freq-factor) (log tone-factor)))&lt;br /&gt;
          (simple-diff (rationalize (inexact-&amp;gt;exact diff) 1/144)))&lt;br /&gt;
     #{ \transposition #(ly:make-pitch 0 0 simple-diff) #}))&lt;br /&gt;
&lt;br /&gt;
\score {&lt;br /&gt;
  \midi { }&lt;br /&gt;
  \layout { }&lt;br /&gt;
  \fixed c&amp;#039; {&lt;br /&gt;
     \hertzTuning 415&lt;br /&gt;
      c8 d e f g a b c&amp;#039;&lt;br /&gt;
      \hertzTuning 442&lt;br /&gt;
      c d e f g a b c&amp;#039;&lt;br /&gt;
  }&lt;br /&gt;
}&lt;br /&gt;
&amp;lt;/lilypond&amp;gt;&lt;br /&gt;
&lt;br /&gt;
[[Category:Pitches]]&lt;br /&gt;
[[Category:Pitches]]&lt;br /&gt;
[[Category:Midi]]&lt;/div&gt;</summary>
		<author><name>Jean Abou Samra</name></author>
	</entry>
</feed>