diff --git a/English.lproj/VLDocument.xib b/English.lproj/VLDocument.xib
index afd9ea9..8b922ec 100644
--- a/English.lproj/VLDocument.xib
+++ b/English.lproj/VLDocument.xib
@@ -2,10 +2,10 @@
 <archive type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="8.00">
 	<data>
 		<int key="IBDocument.SystemTarget">1070</int>
-		<string key="IBDocument.SystemVersion">11C48</string>
+		<string key="IBDocument.SystemVersion">11B26</string>
 		<string key="IBDocument.InterfaceBuilderVersion">1617</string>
-		<string key="IBDocument.AppKitVersion">1138.18</string>
-		<string key="IBDocument.HIToolboxVersion">567.00</string>
+		<string key="IBDocument.AppKitVersion">1138</string>
+		<string key="IBDocument.HIToolboxVersion">566.00</string>
 		<object class="NSMutableDictionary" key="IBDocument.PluginVersions">
 			<string key="NS.key.0">com.apple.InterfaceBuilder.CocoaPlugin</string>
 			<string key="NS.object.0">1617</string>
@@ -1584,7 +1584,7 @@
 					<reference key="NSWindow"/>
 					<reference key="NSNextKeyView" ref="1036200358"/>
 				</object>
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 				<string key="NSMaxSize">{10000000000000, 10000000000000}</string>
 				<int key="NSWindowCollectionBehavior">128</int>
@@ -1800,7 +1800,7 @@
 					</array>
 					<string key="NSFrameSize">{338, 127}</string>
 				</object>
-				<string key="NSScreenRect">{{0, 0}, {1440, 878}}</string>
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 				<string key="NSMinSize">{213, 129}</string>
 				<string key="NSMaxSize">{10000000000000, 10000000000000}</string>
 				<bool key="NSWindowIsRestorable">YES</bool>
@@ -2385,7 +2385,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 					</array>
 					<string key="NSFrameSize">{372, 142}</string>
 				</object>
-				<string key="NSScreenRect">{{0, 0}, {1440, 878}}</string>
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 				<string key="NSMinSize">{213, 129}</string>
 				<string key="NSMaxSize">{10000000000000, 10000000000000}</string>
 				<bool key="NSWindowIsRestorable">YES</bool>
@@ -2403,7 +2403,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 				<nil key="NSUserInterfaceItemIdentifier"/>
 				<string key="NSWindowContentMinSize">{213, 107}</string>
 				<object class="NSView" key="NSWindowView" id="144987606">
-					<nil key="NSNextResponder"/>
+					<reference key="NSNextResponder"/>
 					<int key="NSvFlags">256</int>
 					<array class="NSMutableArray" key="NSSubviews">
 						<object class="NSButton" id="258969335">
@@ -2411,6 +2411,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 							<int key="NSvFlags">256</int>
 							<string key="NSFrame">{{334, 12}, {82, 32}}</string>
 							<reference key="NSSuperview" ref="144987606"/>
+							<reference key="NSWindow"/>
 							<reference key="NSNextKeyView" ref="637723766"/>
 							<int key="NSTag">1001</int>
 							<bool key="NSEnabled">YES</bool>
@@ -2435,6 +2436,8 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 							<int key="NSvFlags">256</int>
 							<string key="NSFrame">{{416, 12}, {113, 32}}</string>
 							<reference key="NSSuperview" ref="144987606"/>
+							<reference key="NSWindow"/>
+							<reference key="NSNextKeyView"/>
 							<int key="NSTag">1000</int>
 							<bool key="NSEnabled">YES</bool>
 							<object class="NSButtonCell" key="NSCell" id="584837621">
@@ -2466,6 +2469,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
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 											<string key="NSFrame">{{109, 72}, {69, 17}}</string>
 											<reference key="NSSuperview" ref="509937598"/>
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 											<reference key="NSNextKeyView" ref="328622856"/>
 											<bool key="NSEnabled">YES</bool>
 											<object class="NSTextFieldCell" key="NSCell" id="138800772">
@@ -2483,6 +2487,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
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 											<reference key="NSSuperview" ref="509937598"/>
+											<reference key="NSWindow"/>
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 											<bool key="NSEnabled">YES</bool>
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@@ -2575,6 +2580,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
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 											<reference key="NSSuperview" ref="509937598"/>
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 											<reference key="NSNextKeyView" ref="791084425"/>
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 											<string key="NSFrame">{{164, 40}, {65, 26}}</string>
 											<reference key="NSSuperview" ref="509937598"/>
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 											<bool key="NSEnabled">YES</bool>
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 											<reference key="NSSuperview" ref="509937598"/>
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@@ -2701,6 +2709,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
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 											<bool key="NSEnabled">YES</bool>
 											<object class="NSTextFieldCell" key="NSCell" id="19061262">
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 											<string key="NSFrame">{{164, 8}, {65, 26}}</string>
 											<reference key="NSSuperview" ref="509937598"/>
+											<reference key="NSWindow"/>
 											<reference key="NSNextKeyView" ref="642172756"/>
 											<bool key="NSEnabled">YES</bool>
 											<object class="NSPopUpButtonCell" key="NSCell" id="62185014">
@@ -2853,11 +2863,13 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 									</array>
 									<string key="NSFrame">{{1, 1}, {244, 100}}</string>
 									<reference key="NSSuperview" ref="863383585"/>
+									<reference key="NSWindow"/>
 									<reference key="NSNextKeyView" ref="727038923"/>
 								</object>
 							</array>
 							<string key="NSFrame">{{17, 200}, {246, 116}}</string>
 							<reference key="NSSuperview" ref="144987606"/>
+							<reference key="NSWindow"/>
 							<reference key="NSNextKeyView" ref="509937598"/>
 							<string key="NSOffsets">{0, 0}</string>
 							<object class="NSTextFieldCell" key="NSTitleCell">
@@ -2890,6 +2902,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
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 											<object class="NSComboBoxCell" key="NSCell" id="8258899">
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 											<reference key="NSSuperview" ref="1028994969"/>
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 											<reference key="NSNextKeyView" ref="266379137"/>
 											<bool key="NSEnabled">YES</bool>
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 											<reference key="NSSuperview" ref="1028994969"/>
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 											<reference key="NSNextKeyView" ref="219147002"/>
 											<bool key="NSEnabled">YES</bool>
 											<object class="NSTextFieldCell" key="NSCell" id="41613899">
@@ -3006,6 +3021,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
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 											<reference key="NSSuperview" ref="1028994969"/>
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 											<bool key="NSEnabled">YES</bool>
 											<object class="NSTextFieldCell" key="NSCell" id="804242312">
@@ -3023,6 +3039,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
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 											<reference key="NSSuperview" ref="1028994969"/>
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 											<bool key="NSEnabled">YES</bool>
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 											<reference key="NSSuperview" ref="1028994969"/>
+											<reference key="NSWindow"/>
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 											<bool key="NSEnabled">YES</bool>
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@@ -3121,6 +3139,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
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 											<bool key="NSEnabled">YES</bool>
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 											<reference key="NSSuperview" ref="1028994969"/>
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 											<bool key="NSEnabled">YES</bool>
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 											<reference key="NSSuperview" ref="1028994969"/>
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@@ -3336,6 +3359,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
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@@ -3435,6 +3460,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
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 						</object>
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 					<string key="NSFrameSize">{537, 336}</string>
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 					<reference key="NSNextKeyView" ref="863383585"/>
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-						<reference key="source" ref="328622856"/>
-						<reference key="destination" ref="911961120"/>
-						<object class="NSNibBindingConnector" key="connector">
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-					</object>
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-						<string key="label">selectedIndex: editNumBotLedgers</string>
-						<reference key="source" ref="791084425"/>
-						<reference key="destination" ref="911961120"/>
-						<object class="NSNibBindingConnector" key="connector">
-							<reference key="NSSource" ref="791084425"/>
-							<reference key="NSDestination" ref="911961120"/>
-							<string key="NSLabel">selectedIndex: editNumBotLedgers</string>
-							<string key="NSBinding">selectedIndex</string>
-							<string key="NSKeyPath">editNumBotLedgers</string>
-							<int key="NSNibBindingConnectorVersion">2</int>
-						</object>
-					</object>
-					<int key="connectionID">326</int>
-				</object>
-				<object class="IBConnectionRecord">
-					<object class="IBBindingConnection" key="connection">
-						<string key="label">selectedIndex: editNumStanzas</string>
-						<reference key="source" ref="709188531"/>
-						<reference key="destination" ref="911961120"/>
-						<object class="NSNibBindingConnector" key="connector">
-							<reference key="NSSource" ref="709188531"/>
-							<reference key="NSDestination" ref="911961120"/>
-							<string key="NSLabel">selectedIndex: editNumStanzas</string>
-							<string key="NSBinding">selectedIndex</string>
-							<string key="NSKeyPath">editNumStanzas</string>
-							<int key="NSNibBindingConnectorVersion">2</int>
-						</object>
-					</object>
-					<int key="connectionID">327</int>
-				</object>
 				<object class="IBConnectionRecord">
 					<object class="IBOutletConnection" key="connection">
 						<string key="label">fDisplaySheet</string>
@@ -4469,6 +4456,62 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 					</object>
 					<int key="connectionID">100521</int>
 				</object>
+				<object class="IBConnectionRecord">
+					<object class="IBBindingConnection" key="connection">
+						<string key="label">selectedIndex: sheetView.numTopLedgers</string>
+						<reference key="source" ref="328622856"/>
+						<reference key="destination" ref="911961120"/>
+						<object class="NSNibBindingConnector" key="connector">
+							<reference key="NSSource" ref="328622856"/>
+							<reference key="NSDestination" ref="911961120"/>
+							<string key="NSLabel">selectedIndex: sheetView.numTopLedgers</string>
+							<string key="NSBinding">selectedIndex</string>
+							<string key="NSKeyPath">sheetView.numTopLedgers</string>
+							<int key="NSNibBindingConnectorVersion">2</int>
+						</object>
+					</object>
+					<int key="connectionID">100523</int>
+				</object>
+				<object class="IBConnectionRecord">
+					<object class="IBBindingConnection" key="connection">
+						<string key="label">selectedIndex: sheetView.numBotLedgers</string>
+						<reference key="source" ref="791084425"/>
+						<reference key="destination" ref="911961120"/>
+						<object class="NSNibBindingConnector" key="connector">
+							<reference key="NSSource" ref="791084425"/>
+							<reference key="NSDestination" ref="911961120"/>
+							<string key="NSLabel">selectedIndex: sheetView.numBotLedgers</string>
+							<string key="NSBinding">selectedIndex</string>
+							<string key="NSKeyPath">sheetView.numBotLedgers</string>
+							<int key="NSNibBindingConnectorVersion">2</int>
+						</object>
+					</object>
+					<int key="connectionID">100524</int>
+				</object>
+				<object class="IBConnectionRecord">
+					<object class="IBBindingConnection" key="connection">
+						<string key="label">selectedIndex: sheetView.numStanzas</string>
+						<reference key="source" ref="709188531"/>
+						<reference key="destination" ref="911961120"/>
+						<object class="NSNibBindingConnector" key="connector">
+							<reference key="NSSource" ref="709188531"/>
+							<reference key="NSDestination" ref="911961120"/>
+							<string key="NSLabel">selectedIndex: sheetView.numStanzas</string>
+							<string key="NSBinding">selectedIndex</string>
+							<string key="NSKeyPath">sheetView.numStanzas</string>
+							<int key="NSNibBindingConnectorVersion">2</int>
+						</object>
+					</object>
+					<int key="connectionID">100525</int>
+				</object>
+				<object class="IBConnectionRecord">
+					<object class="IBOutletConnection" key="connection">
+						<string key="label">displaySheet</string>
+						<reference key="source" ref="911961120"/>
+						<reference key="destination" ref="244935157"/>
+					</object>
+					<int key="connectionID">100526</int>
+				</object>
 			</array>
 			<object class="IBMutableOrderedSet" key="objectRecords">
 				<array key="orderedObjects">
@@ -6447,7 +6490,7 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 			<nil key="activeLocalization"/>
 			<dictionary class="NSMutableDictionary" key="localizations"/>
 			<nil key="sourceID"/>
-			<int key="maxID">100521</int>
+			<int key="maxID">100526</int>
 		</object>
 		<object class="IBClassDescriber" key="IBDocument.Classes">
 			<array class="NSMutableArray" key="referencedPartialClassDescriptions">
@@ -6469,126 +6512,6 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 						<string key="minorKey"/>
 					</object>
 				</object>
-				<object class="IBPartialClassDescription">
-					<string key="className">IKImageView</string>
-					<object class="NSMutableDictionary" key="actions">
-						<string key="NS.key.0">crop:</string>
-						<string key="NS.object.0">id</string>
-					</object>
-					<object class="NSMutableDictionary" key="actionInfosByName">
-						<string key="NS.key.0">crop:</string>
-						<object class="IBActionInfo" key="NS.object.0">
-							<string key="name">crop:</string>
-							<string key="candidateClassName">id</string>
-						</object>
-					</object>
-					<object class="IBClassDescriptionSource" key="sourceIdentifier">
-						<string key="majorKey">IBProjectSource</string>
-						<string key="minorKey">./Classes/IKImageView.h</string>
-					</object>
-				</object>
-				<object class="IBPartialClassDescription">
-					<string key="className">NSDocument</string>
-					<dictionary class="NSMutableDictionary" key="actions">
-						<string key="printDocument:">id</string>
-						<string key="revertDocumentToSaved:">id</string>
-						<string key="runPageLayout:">id</string>
-						<string key="saveDocument:">id</string>
-						<string key="saveDocumentAs:">id</string>
-						<string key="saveDocumentTo:">id</string>
-					</dictionary>
-					<dictionary class="NSMutableDictionary" key="actionInfosByName">
-						<object class="IBActionInfo" key="printDocument:">
-							<string key="name">printDocument:</string>
-							<string key="candidateClassName">id</string>
-						</object>
-						<object class="IBActionInfo" key="revertDocumentToSaved:">
-							<string key="name">revertDocumentToSaved:</string>
-							<string key="candidateClassName">id</string>
-						</object>
-						<object class="IBActionInfo" key="runPageLayout:">
-							<string key="name">runPageLayout:</string>
-							<string key="candidateClassName">id</string>
-						</object>
-						<object class="IBActionInfo" key="saveDocument:">
-							<string key="name">saveDocument:</string>
-							<string key="candidateClassName">id</string>
-						</object>
-						<object class="IBActionInfo" key="saveDocumentAs:">
-							<string key="name">saveDocumentAs:</string>
-							<string key="candidateClassName">id</string>
-						</object>
-						<object class="IBActionInfo" key="saveDocumentTo:">
-							<string key="name">saveDocumentTo:</string>
-							<string key="candidateClassName">id</string>
-						</object>
-					</dictionary>
-					<object class="IBClassDescriptionSource" key="sourceIdentifier">
-						<string key="majorKey">IBProjectSource</string>
-						<string key="minorKey">./Classes/NSDocument.h</string>
-					</object>
-				</object>
-				<object class="IBPartialClassDescription">
-					<string key="className">VLDocument</string>
-					<string key="superclassName">NSDocument</string>
-					<dictionary class="NSMutableDictionary" key="actions">
-						<string key="adjustTempo:">id</string>
-						<string key="dump:">id</string>
-						<string key="play:">id</string>
-						<string key="playMusic:">id</string>
-						<string key="playStop:">id</string>
-						<string key="stop:">id</string>
-					</dictionary>
-					<dictionary class="NSMutableDictionary" key="actionInfosByName">
-						<object class="IBActionInfo" key="adjustTempo:">
-							<string key="name">adjustTempo:</string>
-							<string key="candidateClassName">id</string>
-						</object>
-						<object class="IBActionInfo" key="dump:">
-							<string key="name">dump:</string>
-							<string key="candidateClassName">id</string>
-						</object>
-						<object class="IBActionInfo" key="play:">
-							<string key="name">play:</string>
-							<string key="candidateClassName">id</string>
-						</object>
-						<object class="IBActionInfo" key="playMusic:">
-							<string key="name">playMusic:</string>
-							<string key="candidateClassName">id</string>
-						</object>
-						<object class="IBActionInfo" key="playStop:">
-							<string key="name">playStop:</string>
-							<string key="candidateClassName">id</string>
-						</object>
-						<object class="IBActionInfo" key="stop:">
-							<string key="name">stop:</string>
-							<string key="candidateClassName">id</string>
-						</object>
-					</dictionary>
-					<object class="IBClassDescriptionSource" key="sourceIdentifier">
-						<string key="majorKey">IBProjectSource</string>
-						<string key="minorKey">./Classes/VLDocument.h</string>
-					</object>
-				</object>
-				<object class="IBPartialClassDescription">
-					<string key="className">VLLogWindow</string>
-					<string key="superclassName">NSWindowController</string>
-					<object class="NSMutableDictionary" key="outlets">
-						<string key="NS.key.0">log</string>
-						<string key="NS.object.0">id</string>
-					</object>
-					<object class="NSMutableDictionary" key="toOneOutletInfosByName">
-						<string key="NS.key.0">log</string>
-						<object class="IBToOneOutletInfo" key="NS.object.0">
-							<string key="name">log</string>
-							<string key="candidateClassName">id</string>
-						</object>
-					</object>
-					<object class="IBClassDescriptionSource" key="sourceIdentifier">
-						<string key="majorKey">IBProjectSource</string>
-						<string key="minorKey">./Classes/VLLogWindow.h</string>
-					</object>
-				</object>
 				<object class="IBPartialClassDescription">
 					<string key="className">VLPDFWindow</string>
 					<string key="superclassName">NSWindowController</string>
@@ -6618,7 +6541,6 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 						<string key="copy:">id</string>
 						<string key="cut:">id</string>
 						<string key="delete:">id</string>
-						<string key="editDisplayOptions:">id</string>
 						<string key="editRepeat:">id</string>
 						<string key="editRepeatEnding:">id</string>
 						<string key="endSheetWithButton:">id</string>
@@ -6632,6 +6554,8 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 						<string key="setKey:">id</string>
 						<string key="setTime:">id</string>
 						<string key="transposeOctave:">id</string>
+						<string key="zoomIn:">id</string>
+						<string key="zoomOut:">id</string>
 					</dictionary>
 					<dictionary class="NSMutableDictionary" key="actionInfosByName">
 						<object class="IBActionInfo" key="copy:">
@@ -6646,10 +6570,6 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 							<string key="name">delete:</string>
 							<string key="candidateClassName">id</string>
 						</object>
-						<object class="IBActionInfo" key="editDisplayOptions:">
-							<string key="name">editDisplayOptions:</string>
-							<string key="candidateClassName">id</string>
-						</object>
 						<object class="IBActionInfo" key="editRepeat:">
 							<string key="name">editRepeat:</string>
 							<string key="candidateClassName">id</string>
@@ -6702,9 +6622,16 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 							<string key="name">transposeOctave:</string>
 							<string key="candidateClassName">id</string>
 						</object>
+						<object class="IBActionInfo" key="zoomIn:">
+							<string key="name">zoomIn:</string>
+							<string key="candidateClassName">id</string>
+						</object>
+						<object class="IBActionInfo" key="zoomOut:">
+							<string key="name">zoomOut:</string>
+							<string key="candidateClassName">id</string>
+						</object>
 					</dictionary>
 					<dictionary class="NSMutableDictionary" key="outlets">
-						<string key="fDisplaySheet">id</string>
 						<string key="fDivisionMenu">id</string>
 						<string key="fEndingMsg">id</string>
 						<string key="fEndingSheet">id</string>
@@ -6716,10 +6643,6 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 						<string key="fTimeMenu">id</string>
 					</dictionary>
 					<dictionary class="NSMutableDictionary" key="toOneOutletInfosByName">
-						<object class="IBToOneOutletInfo" key="fDisplaySheet">
-							<string key="name">fDisplaySheet</string>
-							<string key="candidateClassName">id</string>
-						</object>
 						<object class="IBToOneOutletInfo" key="fDivisionMenu">
 							<string key="name">fDivisionMenu</string>
 							<string key="candidateClassName">id</string>
@@ -6766,26 +6689,61 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 					<string key="className">VLSheetWindow</string>
 					<string key="superclassName">NSWindowController</string>
 					<dictionary class="NSMutableDictionary" key="actions">
+						<string key="adjustTempo:">id</string>
+						<string key="playMusic:">id</string>
+						<string key="playStop:">id</string>
 						<string key="showOutput:">id</string>
+						<string key="stop:">id</string>
 						<string key="togglePlayElements:">id</string>
+						<string key="zoomIn:">id</string>
+						<string key="zoomOut:">id</string>
 					</dictionary>
 					<dictionary class="NSMutableDictionary" key="actionInfosByName">
+						<object class="IBActionInfo" key="adjustTempo:">
+							<string key="name">adjustTempo:</string>
+							<string key="candidateClassName">id</string>
+						</object>
+						<object class="IBActionInfo" key="playMusic:">
+							<string key="name">playMusic:</string>
+							<string key="candidateClassName">id</string>
+						</object>
+						<object class="IBActionInfo" key="playStop:">
+							<string key="name">playStop:</string>
+							<string key="candidateClassName">id</string>
+						</object>
 						<object class="IBActionInfo" key="showOutput:">
 							<string key="name">showOutput:</string>
 							<string key="candidateClassName">id</string>
 						</object>
+						<object class="IBActionInfo" key="stop:">
+							<string key="name">stop:</string>
+							<string key="candidateClassName">id</string>
+						</object>
 						<object class="IBActionInfo" key="togglePlayElements:">
 							<string key="name">togglePlayElements:</string>
 							<string key="candidateClassName">id</string>
 						</object>
+						<object class="IBActionInfo" key="zoomIn:">
+							<string key="name">zoomIn:</string>
+							<string key="candidateClassName">id</string>
+						</object>
+						<object class="IBActionInfo" key="zoomOut:">
+							<string key="name">zoomOut:</string>
+							<string key="candidateClassName">id</string>
+						</object>
 					</dictionary>
 					<dictionary class="NSMutableDictionary" key="outlets">
+						<string key="displaySheet">NSWindow</string>
 						<string key="logWin">VLLogWindow</string>
 						<string key="pdfWin">VLPDFWindow</string>
 						<string key="progressIndicator">NSProgressIndicator</string>
 						<string key="sheetView">VLSheetView</string>
 					</dictionary>
 					<dictionary class="NSMutableDictionary" key="toOneOutletInfosByName">
+						<object class="IBToOneOutletInfo" key="displaySheet">
+							<string key="name">displaySheet</string>
+							<string key="candidateClassName">NSWindow</string>
+						</object>
 						<object class="IBToOneOutletInfo" key="logWin">
 							<string key="name">logWin</string>
 							<string key="candidateClassName">VLLogWindow</string>
@@ -6808,14 +6766,6 @@ AAAAAAAAAAAAAHRleHQAAAAAQ29weXJpZ2h0IEFwcGxlIENvbXB1dGVyLCBJbmMuLCAyMDA1AAAAAA</
 						<string key="minorKey">./Classes/VLSheetWindow.h</string>
 					</object>
 				</object>
-				<object class="IBPartialClassDescription">
-					<string key="className">VLToolbarButton</string>
-					<string key="superclassName">NSButton</string>
-					<object class="IBClassDescriptionSource" key="sourceIdentifier">
-						<string key="majorKey">IBProjectSource</string>
-						<string key="minorKey">./Classes/VLToolbarButton.h</string>
-					</object>
-				</object>
 			</array>
 		</object>
 		<int key="IBDocument.localizationMode">0</int>
diff --git a/Sources/VLDocument.h b/Sources/VLDocument.h
index 4ebbced..623853b 100644
--- a/Sources/VLDocument.h
+++ b/Sources/VLDocument.h
@@ -53,13 +53,13 @@ enum {
     int                 playElements;
 	NSURL *             tmpURL;
 	NSFileWrapper *		vcsWrapper;
-	NSMutableArray* 	observers;
 	NSMutableDictionary*validTmpFiles;
 	int					repeatVolta;
 	bool				brandNew;
 	bool				hasMusicSequence;
 	VLSheetWindow *		sheetWin;
 	VLKeyValueUndo*		undo;
+	VLKeyValueUndo*		staffMetrics;
 	NSRange				previewRange;
 	float				playRate;
 	float				baseTempo;
@@ -95,7 +95,6 @@ enum {
 - (void)	   changedFileWrapper;
 - (void)	   willChangeSong;
 - (void)	   didChangeSong;
-- (void)	   addObserver:(id)observer;
 
 @end
 
diff --git a/Sources/VLDocument.mm b/Sources/VLDocument.mm
index dd98dfc..d422131 100644
--- a/Sources/VLDocument.mm
+++ b/Sources/VLDocument.mm
@@ -104,7 +104,6 @@
 		brandNew			= true;
 		hasMusicSequence	= false;
 		playRate			= 1.0;
-		observers			= [[NSMutableArray alloc] init];
 		validTmpFiles		= [[NSMutableDictionary alloc] initWithCapacity:10];
 		[self setHasUndoManager:YES];
 		undo				=
@@ -117,6 +116,22 @@
 					@"", @"songGroove",
 					@"", @"songTempo",
 					nil]];
+        staffMetrics        =
+            [[VLKeyValueUndo alloc] initWithOwner:self
+                keysAndNames:[NSDictionary dictionaryWithObjectsAndKeys:
+                    @"", @"chordSize",
+                    @"", @"lyricSize",
+                    @"", @"staffSize",
+                    @"", @"topPadding",
+                    @"", @"titlePadding",
+                    @"", @"staffPadding",
+                    @"", @"chordPadding",
+                    @"", @"lyricPadding",
+                    nil]
+                update:^(NSString *keyPath) {
+                    [validTmpFiles removeObjectForKey:@"ly"]; 
+                    [validTmpFiles removeObjectForKey:@"pdf"]; 
+                }];
     }
     return self;
 }
@@ -128,15 +143,8 @@
 	[super updateChangeCount:changeType];
 }
 
-- (void) addObserver:(id)observer
-{
-	[observers addObject:observer];
-}
-
 - (void) close
 {
-	[observers makeObjectsPerformSelector:@selector(removeObservers:) withObject:self];
-	[observers removeAllObjects];
 	[super close];
 }
 
@@ -152,8 +160,8 @@
 	[songComposer release];
 	[songArranger release];
 	[vcsWrapper release];
+    [staffMetrics release];
 	[undo release];
-	[observers release];
 		
 	if (tmpURL) {
 		[[NSFileManager defaultManager] removeItemAtURL:tmpURL error:nil];
@@ -266,30 +274,6 @@
 	[self didChangeSong];
 }
 
-- (void) setChordSize:(float)size
-{
-	[[[self undoManager] prepareWithInvocationTarget:self] setChordSize:chordSize];
-	chordSize = size;
-	[validTmpFiles removeObjectForKey:@"ly"]; 
-	[validTmpFiles removeObjectForKey:@"pdf"]; 
-}
-
-- (void) setLyricSize:(float)size
-{
-	[[[self undoManager] prepareWithInvocationTarget:self] setLyricSize:lyricSize];
-	lyricSize = size;
-	[validTmpFiles removeObjectForKey:@"ly"]; 
-	[validTmpFiles removeObjectForKey:@"pdf"]; 
-}
-
-- (void) setStaffSize:(float)size
-{
-	[[[self undoManager] prepareWithInvocationTarget:self] setStaffSize:staffSize];
-	staffSize = size;
-	[validTmpFiles removeObjectForKey:@"ly"]; 
-	[validTmpFiles removeObjectForKey:@"pdf"]; 
-}
-
 - (void)setPlayElements:(int)elements
 {
     [self willChangeValueForKey:@"playElements"];
diff --git a/Sources/VLKeyValueUndo.h b/Sources/VLKeyValueUndo.h
index 04714fa..dbb8e18 100644
--- a/Sources/VLKeyValueUndo.h
+++ b/Sources/VLKeyValueUndo.h
@@ -6,16 +6,20 @@
 //
 //      (MN)    Matthias Neeracher
 //
-// Copyright © 2007 Matthias Neeracher
+// Copyright © 2007-2011 Matthias Neeracher
 //
 
 #import <Cocoa/Cocoa.h>
 
+typedef void (^VLKeyValueUpdateHook)(NSString * keyPath);
+
 @interface VLKeyValueUndo : NSObject {
-	id				owner;
-	NSDictionary *	keysAndNames;
+	id                      owner;
+	NSDictionary *          keysAndNames;
+    VLKeyValueUpdateHook    updateHook;
 }
 
+- (id)initWithOwner:(id)owner keysAndNames:(NSDictionary *)keysAndNames update:(VLKeyValueUpdateHook)hook;
 - (id)initWithOwner:(id)owner keysAndNames:(NSDictionary *)keysAndNames;
 
 @end
diff --git a/Sources/VLKeyValueUndo.mm b/Sources/VLKeyValueUndo.mm
index 01295a9..1ad0810 100644
--- a/Sources/VLKeyValueUndo.mm
+++ b/Sources/VLKeyValueUndo.mm
@@ -14,12 +14,12 @@
 
 @implementation VLKeyValueUndo
 
-- (id)initWithOwner:(id)o keysAndNames:(NSDictionary *)kn
+- (id)initWithOwner:(id)o keysAndNames:(NSDictionary *)kn update:(VLKeyValueUpdateHook)hook
 {
 	owner			= o;
 	keysAndNames	= [kn retain];
+    updateHook      = Block_copy(hook);
 
-	[owner addObserver:self];
 	for (NSEnumerator * e = [keysAndNames keyEnumerator];
 		 NSString * key = [e nextObject];
 	)
@@ -30,17 +30,19 @@
 	return self;
 }
 
-- (void)removeObservers:(id)target
+- (id)initWithOwner:(id)o keysAndNames:(NSDictionary *)kn
 {
-	for (NSEnumerator * e = [keysAndNames keyEnumerator];
-		 NSString * key = [e nextObject];
-	)
-		[target removeObserver:self forKeyPath:key];
+    return [self initWithOwner:o keysAndNames:kn update:nil];
 }
 
 - (void) dealloc
 {
+	for (NSEnumerator * e = [keysAndNames keyEnumerator];
+		 NSString * key = [e nextObject];
+    )
+		[owner removeObserver:self forKeyPath:key];
 	[keysAndNames release];
+    [updateHook release];
 	[super dealloc];
 }
 
@@ -55,6 +57,8 @@
 		[undo registerUndoWithTarget:owner selector:@selector(setValuesForKeysWithDictionary:) 
 			object: [NSDictionary dictionaryWithObjectsAndKeys: oldVal, keyPath, nil]];
 		[undo setActionName: name];
+        if (updateHook)
+            updateHook(keyPath);
 	}
 }
 
diff --git a/Sources/VLSheetView.h b/Sources/VLSheetView.h
index d512a66..0da0174 100644
--- a/Sources/VLSheetView.h
+++ b/Sources/VLSheetView.h
@@ -13,6 +13,7 @@
 
 #import "VLModel.h"
 #import "VLLayout.h"
+#import "VLKeyValueUndo.h"
 
 @class VLDocument;
 
@@ -98,11 +99,11 @@ enum VLCursorVisual {
 	size_t				fHighlightStanza;
 	bool				fHighlightNow;
 	bool				fHighlightOne;
+    VLKeyValueUndo *    fUndo;
 
 	IBOutlet id			fFieldEditor;
 	IBOutlet id			fRepeatSheet;
 	IBOutlet id			fEndingSheet;
-	IBOutlet id			fDisplaySheet;
 	IBOutlet id			fRepeatMsg;
 	IBOutlet id			fEndingMsg;
 	IBOutlet id			fGrooveMenu;
@@ -111,15 +112,19 @@ enum VLCursorVisual {
 	IBOutlet id			fDivisionMenu;
 }
 
+@property (nonatomic) int   numTopLedgers;
+@property (nonatomic) int   numBotLedgers;
+@property (nonatomic) int   numStanzas;
+
 - (IBAction) setKey:(id)sender;
 - (IBAction) setTime:(id)sender;
 - (IBAction) setDivisions:(id)sender;
 - (IBAction) hideFieldEditor:(id)sender;
 - (IBAction) endSheetWithButton:(id)sender;
 - (IBAction) selectGroove:(id)sender;
-- (IBAction) editDisplayOptions:(id)sender;
 - (IBAction) transposeOctave:(id)sender;
-
+- (IBAction) zoomIn: (id) sender;
+- (IBAction) zoomOut: (id) sender;
 
 - (VLDocument *) document;
 - (VLSong *) song;
@@ -133,6 +138,7 @@ enum VLCursorVisual {
 - (VLMusicElement)accidentalForVisual:(uint16_t)visual;
 - (float) noteYInMeasure:(int)measure withGrid:(int)vertPos;
 - (float) noteXInMeasure:(int)measure at:(VLFraction)at;
+- (void)  needsRecalculation;
 
 - (void) scrollMeasureToVisible:(int)measure;
 
@@ -151,6 +157,7 @@ enum VLCursorVisual {
 - (void) playWithGroove:(NSString *)groove;
 
 - (NSColor *)textBackgroundColorForSystem:(int)system;
+- (void)removeObservers:(id)target;
 
 @end
 
diff --git a/Sources/VLSheetView.mm b/Sources/VLSheetView.mm
index f28c7bc..0805a40 100644
--- a/Sources/VLSheetView.mm
+++ b/Sources/VLSheetView.mm
@@ -25,6 +25,11 @@
 
 @implementation VLSheetView
 
+@synthesize 
+    numTopLedgers   = fNumTopLedgers,
+    numBotLedgers   = fNumBotLedgers,
+    numStanzas      = fNumStanzas;
+
 static NSString * sElementNames[kMusicElements] = {
 	@"g-clef",
 	@"flat",
@@ -105,10 +110,25 @@ static float sFlatPos[] = {
 		fNumStanzas    		= 2;
 		fLastMeasures		= 0;
 		fHighlightOne		= false;
+        fUndo               = [[VLKeyValueUndo alloc] 
+            initWithOwner:self 
+            keysAndNames:[NSDictionary dictionaryWithObjectsAndKeys:
+                @"", @"numTopLedgers",
+                @"", @"numBotLedgers",
+                @"", @"numStanzas",
+                nil]];
 	}
     return self;
 }
 
+- (void)dealloc
+{
+    [self removeObservers:[self document]];
+    delete [] fMusic;
+    [fUndo release];
+    [super dealloc];
+}
+
 - (BOOL)acceptsFirstResponder
 {
 	return YES;
@@ -292,6 +312,12 @@ static float sFlatPos[] = {
 	fNeedsRecalc	= kNoRecalc;	
 }
 
+- (void)needsRecalculation
+{
+    fNeedsRecalc    = kRecalc;
+    [self setNeedsDisplay:YES];
+}
+
 const char * sBreak[3] = {"", "\xE2\xA4\xBE", "\xE2\x8E\x98"};
 
 - (void)drawGridForSystem:(int)system
@@ -934,7 +960,6 @@ const float kSemiFloor = -1.0f*kLineH;
 {
 	VLDocument * doc = [self document];
 
-	[doc addObserver:self];
 	[doc addObserver:self forKeyPath:@"song" options:0 context:nil];
 	[doc addObserver:self forKeyPath:@"songKey" options:0 context:nil];	
 	[doc addObserver:self forKeyPath:@"songTime" options:0 context:nil];	
@@ -1004,49 +1029,5 @@ const float kSemiFloor = -1.0f*kLineH;
 	[[self document] playWithGroove:groove inSections:[self sectionsInSelection]];
 }
 
-- (IBAction)editDisplayOptions:(id)sender
-{
-	NSUndoManager * undoMgr = [[self document] undoManager];	
-	[undoMgr setGroupsByEvent:NO];
-	[undoMgr beginUndoGrouping];
-
-	VLSheetWindow * wc = [[self window] windowController];
-	[wc setValue:[NSNumber numberWithInt:fNumTopLedgers] 
-		forKey:@"editNumTopLedgers"];
-	[wc setValue:[NSNumber numberWithInt:fNumBotLedgers] 
-		forKey:@"editNumBotLedgers"];
-	[wc setValue:[NSNumber numberWithInt:fNumStanzas] 
-		forKey:@"editNumStanzas"];
-
-	[NSApp beginSheet:fDisplaySheet modalForWindow:[self window]
-		   modalDelegate:self 
-		   didEndSelector:@selector(didEndDisplaySheet:returnCode:contextInfo:)
-		   contextInfo:nil];
-}
-
-- (void)didEndDisplaySheet:(NSWindow *)sheet returnCode:(int)returnCode 
-			  contextInfo:(void *)ctx
-{
-	NSUndoManager * undoMgr = [[self document] undoManager];
-	[undoMgr setActionName:@"Display Options"];
-	[undoMgr endUndoGrouping];
-	[undoMgr setGroupsByEvent:YES];
-
-	switch (returnCode) {
-	case NSAlertFirstButtonReturn: {
-		VLSheetWindow * wc = [[self window] windowController];
-		fNumTopLedgers = [[wc valueForKey:@"editNumTopLedgers"] intValue];
-		fNumBotLedgers = [[wc valueForKey:@"editNumBotLedgers"] intValue];
-		fNumStanzas    = [[wc valueForKey:@"editNumStanzas"] intValue];
-		fNeedsRecalc   = kRecalc;
-		[self setNeedsDisplay:YES];
-	    } break;
-	default:
-		[undoMgr undo];
-		break;
-	}	
-	[sheet orderOut:self];
-}
-
 @end
 	
diff --git a/Sources/VLSheetWindow.h b/Sources/VLSheetWindow.h
index 92f6b89..a3e71b8 100644
--- a/Sources/VLSheetWindow.h
+++ b/Sources/VLSheetWindow.h
@@ -28,11 +28,12 @@
 @class VLLogWindow;
 @class VLPDFWindow;
 
-@interface VLSheetWindow : NSWindowController <NSToolbarDelegate> {
+@interface VLSheetWindow : NSWindowController <NSToolbarDelegate,NSWindowDelegate> {
 	IBOutlet VLSheetView *          sheetView;
     IBOutlet NSProgressIndicator *  progressIndicator;
     IBOutlet VLLogWindow *          logWin;
 	IBOutlet VLPDFWindow *          pdfWin;
+    IBOutlet NSWindow *             displaySheet;
     id                              soundStartObserver;
     id                              soundStopObserver;
 
@@ -52,6 +53,8 @@
 - (IBAction) playStop:(id)sender;
 - (IBAction) playMusic:(id)sender;
 - (IBAction) adjustTempo:(id)sender;
+- (IBAction) zoomIn: (id) sender;
+- (IBAction) zoomOut: (id) sender;
 
 - (VLEditable *) editTarget;
 - (void) setEditTarget:(VLEditable *)editable;
diff --git a/Sources/VLSheetWindow.mm b/Sources/VLSheetWindow.mm
index 404e439..ce87133 100644
--- a/Sources/VLSheetWindow.mm
+++ b/Sources/VLSheetWindow.mm
@@ -13,6 +13,8 @@
 #import "VLPDFWindow.h"
 #import "VLLogWindow.h"
 #import "VLSoundOut.h"
+#import "VLSheetView.h"
+#import "VLSheetViewSelection.h"
 
 @implementation VLEditable
 
@@ -189,5 +191,40 @@
 	[[self document] setSongTempo:[[self document] songTempo]+[sender tag]];
 }
 
+- (IBAction)editDisplayOptions:(id)sender
+{
+	NSUndoManager * undoMgr = [[self document] undoManager];	
+	[undoMgr setGroupsByEvent:NO];
+	[undoMgr beginUndoGrouping];
+        
+	[NSApp beginSheet:displaySheet modalForWindow:[self window]
+        modalDelegate:self 
+       didEndSelector:@selector(didEndDisplaySheet:returnCode:contextInfo:)
+          contextInfo:nil];
+}
+
+- (void)didEndDisplaySheet:(NSWindow *)sheet returnCode:(int)returnCode 
+               contextInfo:(void *)ctx
+{
+	NSUndoManager * undoMgr = [[self document] undoManager];
+	[undoMgr setActionName:@"Display Options"];
+	[undoMgr endUndoGrouping];
+	[undoMgr setGroupsByEvent:YES];
+    
+	switch (returnCode) {
+        case NSAlertFirstButtonReturn:
+            [sheetView needsRecalculation];
+            break;
+        default:
+            [undoMgr undo];
+            break;
+	}	
+	[sheet orderOut:self];
+}
+
+- (NSUndoManager *)windowWillReturnUndoManager:(NSWindow *)window
+{
+    return [[self document] undoManager];
+}
 
 @end