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<a name="AutoChangeMusic"></a>
<h3 class="subsection">1.1.7 AutoChangeMusic</h3>
<p>Used for making voices that switch between
piano staves automatically.
</p>
<p>Properties:
</p>
<blockquote><dl compact="compact">
<dt> <code>name</code> (symbol):</dt>
<dd>
<p><code>'AutoChangeMusic</code>
</p>
<p>Name of this music object.
</p></dd>
<dt> <code>iterator-ctor</code> (procedure):</dt>
<dd>
<p><code>ly:auto-change-iterator::constructor</code>
</p>
<p>Function to construct a
<code>music-event-iterator</code> object for this music.
</p></dd>
<dt> <code>start-callback</code> (procedure):</dt>
<dd>
<p><code>ly:music-wrapper::start-callback</code>
</p>
<p>Function to compute the negative length
of starting grace notes. This property can only be defined as initializer
in ‘<tt>scm/define-music-types.scm</tt>’.
</p></dd>
<dt> <code>length-callback</code> (procedure):</dt>
<dd>
<p><code>ly:music-wrapper::length-callback</code>
</p>
<p>How to compute the duration of this music.
This property can only be defined as initializer in
‘<tt>scm/define-music-types.scm</tt>’.
</p></dd>
<dt> <code>types</code> (list):</dt>
<dd>
<p><code>'(general-music music-wrapper-music auto-change-instruction)</code>
</p>
<p>The types of this music object; determines by what
engraver this music expression is processed.
</p></dd>
</dl>
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<h4 class="toc_header"> <a href="index.html#Top" title="Start of the manual">Internals Reference</a></h4>
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<ul class="toc">
<li class="toc_current"><a name="toc-Music-definitions-1" href="Music-definitions.html#Music-definitions">1. Music definitions</a>
<ul class="toc">
<li class="toc_current"><a name="toc-Music-expressions-1" href="Music-expressions.html#Music-expressions">1.1 Music expressions</a>
<ul class="toc">
<li><a name="toc-AbsoluteDynamicEvent-1" href="AbsoluteDynamicEvent.html#AbsoluteDynamicEvent">1.1.1 AbsoluteDynamicEvent</a> </li>
<li><a name="toc-AnnotateOutputEvent-1" href="AnnotateOutputEvent.html#AnnotateOutputEvent">1.1.2 AnnotateOutputEvent</a> </li>
<li><a name="toc-ApplyContext-1" href="ApplyContext.html#ApplyContext">1.1.3 ApplyContext</a> </li>
<li><a name="toc-ApplyOutputEvent-1" href="ApplyOutputEvent.html#ApplyOutputEvent">1.1.4 ApplyOutputEvent</a> </li>
<li><a name="toc-ArpeggioEvent-1" href="ArpeggioEvent.html#ArpeggioEvent">1.1.5 ArpeggioEvent</a> </li>
<li><a name="toc-ArticulationEvent-1" href="ArticulationEvent.html#ArticulationEvent">1.1.6 ArticulationEvent</a> </li>
<li class="toc_current"><a name="toc-AutoChangeMusic-1" href="AutoChangeMusic.html#AutoChangeMusic">1.1.7 AutoChangeMusic</a> </li>
<li><a name="toc-BarCheck-1" href="BarCheck.html#BarCheck">1.1.8 BarCheck</a> </li>
<li><a name="toc-BassFigureEvent-1" href="BassFigureEvent.html#BassFigureEvent">1.1.9 BassFigureEvent</a> </li>
<li><a name="toc-BeamEvent-1" href="BeamEvent.html#BeamEvent">1.1.10 BeamEvent</a> </li>
<li><a name="toc-BeamForbidEvent-1" href="BeamForbidEvent.html#BeamForbidEvent">1.1.11 BeamForbidEvent</a> </li>
<li><a name="toc-BendAfterEvent-1" href="BendAfterEvent.html#BendAfterEvent">1.1.12 BendAfterEvent</a> </li>
<li><a name="toc-BreathingEvent-1" href="BreathingEvent.html#BreathingEvent">1.1.13 BreathingEvent</a> </li>
<li><a name="toc-ClusterNoteEvent-1" href="ClusterNoteEvent.html#ClusterNoteEvent">1.1.14 ClusterNoteEvent</a> </li>
<li><a name="toc-ContextChange-1" href="ContextChange.html#ContextChange">1.1.15 ContextChange</a> </li>
<li><a name="toc-ContextSpeccedMusic-1" href="ContextSpeccedMusic.html#ContextSpeccedMusic">1.1.16 ContextSpeccedMusic</a> </li>
<li><a name="toc-CrescendoEvent-1" href="CrescendoEvent.html#CrescendoEvent">1.1.17 CrescendoEvent</a> </li>
<li><a name="toc-DecrescendoEvent-1" href="DecrescendoEvent.html#DecrescendoEvent">1.1.18 DecrescendoEvent</a> </li>
<li><a name="toc-Event-1" href="Event.html#Event">1.1.19 Event</a> </li>
<li><a name="toc-EventChord-1" href="EventChord.html#EventChord">1.1.20 EventChord</a> </li>
<li><a name="toc-ExtenderEvent-1" href="ExtenderEvent.html#ExtenderEvent">1.1.21 ExtenderEvent</a> </li>
<li><a name="toc-FingeringEvent-1" href="FingeringEvent.html#FingeringEvent">1.1.22 FingeringEvent</a> </li>
<li><a name="toc-GlissandoEvent-1" href="GlissandoEvent.html#GlissandoEvent">1.1.23 GlissandoEvent</a> </li>
<li><a name="toc-GraceMusic-1" href="GraceMusic.html#GraceMusic">1.1.24 GraceMusic</a> </li>
<li><a name="toc-HarmonicEvent-1" href="HarmonicEvent.html#HarmonicEvent">1.1.25 HarmonicEvent</a> </li>
<li><a name="toc-HyphenEvent-1" href="HyphenEvent.html#HyphenEvent">1.1.26 HyphenEvent</a> </li>
<li><a name="toc-KeyChangeEvent-1" href="KeyChangeEvent.html#KeyChangeEvent">1.1.27 KeyChangeEvent</a> </li>
<li><a name="toc-LabelEvent-1" href="LabelEvent.html#LabelEvent">1.1.28 LabelEvent</a> </li>
<li><a name="toc-LaissezVibrerEvent-1" href="LaissezVibrerEvent.html#LaissezVibrerEvent">1.1.29 LaissezVibrerEvent</a> </li>
<li><a name="toc-LigatureEvent-1" href="LigatureEvent.html#LigatureEvent">1.1.30 LigatureEvent</a> </li>
<li><a name="toc-LineBreakEvent-1" href="LineBreakEvent.html#LineBreakEvent">1.1.31 LineBreakEvent</a> </li>
<li><a name="toc-LyricCombineMusic-1" href="LyricCombineMusic.html#LyricCombineMusic">1.1.32 LyricCombineMusic</a> </li>
<li><a name="toc-LyricEvent-1" href="LyricEvent.html#LyricEvent">1.1.33 LyricEvent</a> </li>
<li><a name="toc-MarkEvent-1" href="MarkEvent.html#MarkEvent">1.1.34 MarkEvent</a> </li>
<li><a name="toc-MultiMeasureRestEvent-1" href="MultiMeasureRestEvent.html#MultiMeasureRestEvent">1.1.35 MultiMeasureRestEvent</a> </li>
<li><a name="toc-MultiMeasureRestMusic-1" href="MultiMeasureRestMusic.html#MultiMeasureRestMusic">1.1.36 MultiMeasureRestMusic</a> </li>
<li><a name="toc-MultiMeasureTextEvent-1" href="MultiMeasureTextEvent.html#MultiMeasureTextEvent">1.1.37 MultiMeasureTextEvent</a> </li>
<li><a name="toc-Music-1" href="Music.html#Music">1.1.38 Music</a> </li>
<li><a name="toc-NoteEvent-1" href="NoteEvent.html#NoteEvent">1.1.39 NoteEvent</a> </li>
<li><a name="toc-NoteGroupingEvent-1" href="NoteGroupingEvent.html#NoteGroupingEvent">1.1.40 NoteGroupingEvent</a> </li>
<li><a name="toc-OverrideProperty-1" href="OverrideProperty.html#OverrideProperty">1.1.41 OverrideProperty</a> </li>
<li><a name="toc-PageBreakEvent-1" href="PageBreakEvent.html#PageBreakEvent">1.1.42 PageBreakEvent</a> </li>
<li><a name="toc-PageTurnEvent-1" href="PageTurnEvent.html#PageTurnEvent">1.1.43 PageTurnEvent</a> </li>
<li><a name="toc-PartCombineMusic-1" href="PartCombineMusic.html#PartCombineMusic">1.1.44 PartCombineMusic</a> </li>
<li><a name="toc-PercentEvent-1" href="PercentEvent.html#PercentEvent">1.1.45 PercentEvent</a> </li>
<li><a name="toc-PercentRepeatedMusic-1" href="PercentRepeatedMusic.html#PercentRepeatedMusic">1.1.46 PercentRepeatedMusic</a> </li>
<li><a name="toc-PesOrFlexaEvent-1" href="PesOrFlexaEvent.html#PesOrFlexaEvent">1.1.47 PesOrFlexaEvent</a> </li>
<li><a name="toc-PhrasingSlurEvent-1" href="PhrasingSlurEvent.html#PhrasingSlurEvent">1.1.48 PhrasingSlurEvent</a> </li>
<li><a name="toc-PropertySet-1" href="PropertySet.html#PropertySet">1.1.49 PropertySet</a> </li>
<li><a name="toc-PropertyUnset-1" href="PropertyUnset.html#PropertyUnset">1.1.50 PropertyUnset</a> </li>
<li><a name="toc-QuoteMusic-1" href="QuoteMusic.html#QuoteMusic">1.1.51 QuoteMusic</a> </li>
<li><a name="toc-RelativeOctaveCheck-1" href="RelativeOctaveCheck.html#RelativeOctaveCheck">1.1.52 RelativeOctaveCheck</a> </li>
<li><a name="toc-RelativeOctaveMusic-1" href="RelativeOctaveMusic.html#RelativeOctaveMusic">1.1.53 RelativeOctaveMusic</a> </li>
<li><a name="toc-RepeatTieEvent-1" href="RepeatTieEvent.html#RepeatTieEvent">1.1.54 RepeatTieEvent</a> </li>
<li><a name="toc-RepeatedMusic-1" href="RepeatedMusic.html#RepeatedMusic">1.1.55 RepeatedMusic</a> </li>
<li><a name="toc-RestEvent-1" href="RestEvent.html#RestEvent">1.1.56 RestEvent</a> </li>
<li><a name="toc-RevertProperty-1" href="RevertProperty.html#RevertProperty">1.1.57 RevertProperty</a> </li>
<li><a name="toc-ScriptEvent-1" href="ScriptEvent.html#ScriptEvent">1.1.58 ScriptEvent</a> </li>
<li><a name="toc-SequentialMusic-1" href="SequentialMusic.html#SequentialMusic">1.1.59 SequentialMusic</a> </li>
<li><a name="toc-SimultaneousMusic-1" href="SimultaneousMusic.html#SimultaneousMusic">1.1.60 SimultaneousMusic</a> </li>
<li><a name="toc-SkipEvent-1" href="SkipEvent.html#SkipEvent">1.1.61 SkipEvent</a> </li>
<li><a name="toc-SkipMusic-1" href="SkipMusic.html#SkipMusic">1.1.62 SkipMusic</a> </li>
<li><a name="toc-SlurEvent-1" href="SlurEvent.html#SlurEvent">1.1.63 SlurEvent</a> </li>
<li><a name="toc-SoloOneEvent-1" href="SoloOneEvent.html#SoloOneEvent">1.1.64 SoloOneEvent</a> </li>
<li><a name="toc-SoloTwoEvent-1" href="SoloTwoEvent.html#SoloTwoEvent">1.1.65 SoloTwoEvent</a> </li>
<li><a name="toc-SostenutoEvent-1" href="SostenutoEvent.html#SostenutoEvent">1.1.66 SostenutoEvent</a> </li>
<li><a name="toc-SpacingSectionEvent-1" href="SpacingSectionEvent.html#SpacingSectionEvent">1.1.67 SpacingSectionEvent</a> </li>
<li><a name="toc-SpanEvent-1" href="SpanEvent.html#SpanEvent">1.1.68 SpanEvent</a> </li>
<li><a name="toc-StaffSpanEvent-1" href="StaffSpanEvent.html#StaffSpanEvent">1.1.69 StaffSpanEvent</a> </li>
<li><a name="toc-StringNumberEvent-1" href="StringNumberEvent.html#StringNumberEvent">1.1.70 StringNumberEvent</a> </li>
<li><a name="toc-StrokeFingerEvent-1" href="StrokeFingerEvent.html#StrokeFingerEvent">1.1.71 StrokeFingerEvent</a> </li>
<li><a name="toc-SustainEvent-1" href="SustainEvent.html#SustainEvent">1.1.72 SustainEvent</a> </li>
<li><a name="toc-TextScriptEvent-1" href="TextScriptEvent.html#TextScriptEvent">1.1.73 TextScriptEvent</a> </li>
<li><a name="toc-TextSpanEvent-1" href="TextSpanEvent.html#TextSpanEvent">1.1.74 TextSpanEvent</a> </li>
<li><a name="toc-TieEvent-1" href="TieEvent.html#TieEvent">1.1.75 TieEvent</a> </li>
<li><a name="toc-TimeScaledMusic-1" href="TimeScaledMusic.html#TimeScaledMusic">1.1.76 TimeScaledMusic</a> </li>
<li><a name="toc-TransposedMusic-1" href="TransposedMusic.html#TransposedMusic">1.1.77 TransposedMusic</a> </li>
<li><a name="toc-TremoloEvent-1" href="TremoloEvent.html#TremoloEvent">1.1.78 TremoloEvent</a> </li>
<li><a name="toc-TremoloRepeatedMusic-1" href="TremoloRepeatedMusic.html#TremoloRepeatedMusic">1.1.79 TremoloRepeatedMusic</a> </li>
<li><a name="toc-TremoloSpanEvent-1" href="TremoloSpanEvent.html#TremoloSpanEvent">1.1.80 TremoloSpanEvent</a> </li>
<li><a name="toc-TrillSpanEvent-1" href="TrillSpanEvent.html#TrillSpanEvent">1.1.81 TrillSpanEvent</a> </li>
<li><a name="toc-TupletSpanEvent-1" href="TupletSpanEvent.html#TupletSpanEvent">1.1.82 TupletSpanEvent</a> </li>
<li><a name="toc-UnaCordaEvent-1" href="UnaCordaEvent.html#UnaCordaEvent">1.1.83 UnaCordaEvent</a> </li>
<li><a name="toc-UnfoldedRepeatedMusic-1" href="UnfoldedRepeatedMusic.html#UnfoldedRepeatedMusic">1.1.84 UnfoldedRepeatedMusic</a> </li>
<li><a name="toc-UnisonoEvent-1" href="UnisonoEvent.html#UnisonoEvent">1.1.85 UnisonoEvent</a> </li>
<li><a name="toc-UnrelativableMusic-1" href="UnrelativableMusic.html#UnrelativableMusic">1.1.86 UnrelativableMusic</a> </li>
<li><a name="toc-VoiceSeparator-1" href="VoiceSeparator.html#VoiceSeparator">1.1.87 VoiceSeparator</a> </li>
<li><a name="toc-VoltaRepeatedMusic-1" href="VoltaRepeatedMusic.html#VoltaRepeatedMusic">1.1.88 VoltaRepeatedMusic</a> </li>
</ul>
</li>
<li><a name="toc-Music-classes-1" href="Music-classes.html#Music-classes">1.2 Music classes</a> </li>
<li><a name="toc-Music-properties-1" href="Music-properties.html#Music-properties">1.3 Music properties</a> </li>
</ul>
</li>
<li><a name="toc-Translation-1" href="Translation.html#Translation">2. Translation</a>
<ul class="toc">
<li><a name="toc-Contexts-1" href="Contexts.html#Contexts">2.1 Contexts</a> </li>
<li><a name="toc-Engravers-and-Performers-1" href="Engravers-and-Performers.html#Engravers-and-Performers">2.2 Engravers and Performers</a> </li>
<li><a name="toc-Tunable-context-properties-1" href="Tunable-context-properties.html#Tunable-context-properties">2.3 Tunable context properties</a> </li>
<li><a name="toc-Internal-context-properties-1" href="Internal-context-properties.html#Internal-context-properties">2.4 Internal context properties</a> </li>
</ul>
</li>
<li><a name="toc-Backend-1" href="Backend.html#Backend">3. Backend</a>
<ul class="toc">
<li><a name="toc-All-layout-objects-1" href="All-layout-objects.html#All-layout-objects">3.1 All layout objects</a> </li>
<li><a name="toc-Graphical-Object-Interfaces-1" href="Graphical-Object-Interfaces.html#Graphical-Object-Interfaces">3.2 Graphical Object Interfaces</a> </li>
<li><a name="toc-User-backend-properties-1" href="User-backend-properties.html#User-backend-properties">3.3 User backend properties</a> </li>
<li><a name="toc-Internal-backend-properties-1" href="Internal-backend-properties.html#Internal-backend-properties">3.4 Internal backend properties</a> </li>
</ul>
</li>
<li><a name="toc-Scheme-functions-1" href="Scheme-functions.html#Scheme-functions">4. Scheme functions</a> </li>
<li><a name="toc-Indices-1" href="Indices.html#Indices">A. Indices</a>
<ul class="toc">
<li><a name="toc-Concept-index" href="Indices.html#Indices">A.1 Concept index</a> </li>
<li><a name="toc-Function-index" href="Indices.html#Indices">A.2 Function index</a> </li>
</ul>
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