diff --git a/English.lproj/MainMenu.xib b/English.lproj/MainMenu.xib
index d8e9857..1026753 100644
--- a/English.lproj/MainMenu.xib
+++ b/English.lproj/MainMenu.xib
@@ -1,14 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <archive type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="8.00">
 	<data>
-		<int key="IBDocument.SystemTarget">1090</int>
+		<int key="IBDocument.SystemTarget">101000</int>
 		<string key="IBDocument.SystemVersion">14A389</string>
-		<string key="IBDocument.InterfaceBuilderVersion">6245</string>
+		<string key="IBDocument.InterfaceBuilderVersion">6154.17</string>
 		<string key="IBDocument.AppKitVersion">1343.14</string>
 		<string key="IBDocument.HIToolboxVersion">755.00</string>
 		<object class="NSMutableDictionary" key="IBDocument.PluginVersions">
 			<string key="NS.key.0">com.apple.InterfaceBuilder.CocoaPlugin</string>
-			<string key="NS.object.0">6245</string>
+			<string key="NS.object.0">6154.17</string>
 		</object>
 		<array key="IBDocument.IntegratedClassDependencies">
 			<string>NSCustomObject</string>
@@ -18,6 +18,8 @@
 			<string>NSPopUpButtonCell</string>
 			<string>NSScrollView</string>
 			<string>NSScroller</string>
+			<string>NSSlider</string>
+			<string>NSSliderCell</string>
 			<string>NSTextView</string>
 			<string>NSToolbar</string>
 			<string>NSToolbarFlexibleSpaceItem</string>
@@ -1321,6 +1323,48 @@
 					<int key="NSToolbarDisplayMode">1</int>
 					<int key="NSToolbarSizeMode">1</int>
 					<dictionary class="NSMutableDictionary" key="NSToolbarIBIdentifiedItems">
+						<object class="NSToolbarItem" key="6B9D411D-B22D-42EF-A3C2-F6BC2192030C" id="760683990">
+							<string key="NSToolbarItemIdentifier">6B9D411D-B22D-42EF-A3C2-F6BC2192030C</string>
+							<string key="NSToolbarItemLabel">Volume</string>
+							<string key="NSToolbarItemPaletteLabel">Volume</string>
+							<nil key="NSToolbarItemToolTip"/>
+							<object class="NSSlider" key="NSToolbarItemView" id="1056307265">
+								<reference key="NSNextResponder"/>
+								<int key="NSvFlags">268</int>
+								<string key="NSFrame">{{0, 14}, {96, 26}}</string>
+								<reference key="NSSuperview"/>
+								<reference key="NSWindow"/>
+								<reference key="NSNextKeyView"/>
+								<string key="NSReuseIdentifierKey">_NS:9</string>
+								<bool key="NSEnabled">YES</bool>
+								<object class="NSSliderCell" key="NSCell" id="279183685">
+									<int key="NSCellFlags">-2080374784</int>
+									<int key="NSCellFlags2">0</int>
+									<string key="NSContents"/>
+									<string key="NSCellIdentifier">_NS:9</string>
+									<reference key="NSControlView" ref="1056307265"/>
+									<double key="NSMaxValue">100</double>
+									<double key="NSMinValue">0.0</double>
+									<double key="NSValue">50</double>
+									<double key="NSAltIncValue">0.0</double>
+									<int key="NSNumberOfTickMarks">6</int>
+									<int key="NSTickMarkPosition">1</int>
+									<bool key="NSAllowsTickMarkValuesOnly">NO</bool>
+									<bool key="NSVertical">NO</bool>
+								</object>
+								<bool key="NSAllowsLogicalLayoutDirection">NO</bool>
+							</object>
+							<nil key="NSToolbarItemImage"/>
+							<nil key="NSToolbarItemTarget"/>
+							<nil key="NSToolbarItemAction"/>
+							<string key="NSToolbarItemMinSize">{96, 21}</string>
+							<string key="NSToolbarItemMaxSize">{96, 26}</string>
+							<bool key="NSToolbarItemEnabled">YES</bool>
+							<bool key="NSToolbarItemAutovalidates">YES</bool>
+							<int key="NSToolbarItemTag">0</int>
+							<bool key="NSToolbarIsUserRemovable">YES</bool>
+							<int key="NSToolbarItemVisibilityPriority">0</int>
+						</object>
 						<object class="NSToolbarItem" key="BB31836C-C94C-4C54-B51B-8C9C9A2D1280" id="319967180">
 							<object class="NSMutableString" key="NSToolbarItemIdentifier">
 								<characters key="NS.bytes">BB31836C-C94C-4C54-B51B-8C9C9A2D1280</characters>
@@ -1334,6 +1378,7 @@
 								<string key="NSFrame">{{0, 14}, {264, 25}}</string>
 								<reference key="NSSuperview"/>
 								<reference key="NSWindow"/>
+								<reference key="NSNextKeyView"/>
 								<string key="NSReuseIdentifierKey">_NS:868</string>
 								<bool key="NSEnabled">YES</bool>
 								<object class="NSPopUpButtonCell" key="NSCell" id="890650070">
@@ -1586,10 +1631,12 @@
 						<reference ref="911163514"/>
 						<reference ref="405021031"/>
 						<reference ref="319967180"/>
+						<reference ref="760683990"/>
 					</array>
-					<array class="NSMutableArray" key="NSToolbarIBDefaultItems">
+					<array key="NSToolbarIBDefaultItems">
 						<reference ref="405021031"/>
 						<reference ref="188610191"/>
+						<reference ref="760683990"/>
 						<reference ref="448369132"/>
 						<reference ref="188610191"/>
 						<reference ref="319967180"/>
@@ -1803,12 +1850,12 @@ AAEAAQAAAT0AAwAAAAEAAgAAAVIAAwAAAAEAAQAAAVMAAwAAAAIAAQABAAAAAA</bytes>
 			<object class="NSUserDefaultsController" id="789215370">
 				<bool key="NSSharedInstance">YES</bool>
 			</object>
-			<object class="NSCustomObject" id="346086284">
+			<object class="NSCustomObject" id="568888154">
 				<string key="NSClassName">NSSpeechSynthesizer</string>
 			</object>
 		</array>
 		<object class="IBObjectContainer" key="IBDocument.Objects">
-			<array key="connectionRecords">
+			<array class="NSMutableArray" key="connectionRecords">
 				<object class="IBConnectionRecord">
 					<object class="IBActionConnection" key="connection">
 						<string key="label">terminate:</string>
@@ -2521,6 +2568,38 @@ AAEAAQAAAT0AAwAAAAEAAgAAAVIAAwAAAAEAAQAAAVMAAwAAAAIAAQABAAAAAA</bytes>
 					</object>
 					<int key="connectionID">595</int>
 				</object>
+				<object class="IBConnectionRecord">
+					<object class="IBOutletConnection" key="connection">
+						<string key="label">synth</string>
+						<reference key="source" ref="976324537"/>
+						<reference key="destination" ref="568888154"/>
+					</object>
+					<int key="connectionID">621</int>
+				</object>
+				<object class="IBConnectionRecord">
+					<object class="IBActionConnection" key="connection">
+						<string key="label">setVolume:</string>
+						<reference key="source" ref="976324537"/>
+						<reference key="destination" ref="1056307265"/>
+					</object>
+					<int key="connectionID">636</int>
+				</object>
+				<object class="IBConnectionRecord">
+					<object class="IBBindingConnection" key="connection">
+						<string key="label">value: values.volume</string>
+						<reference key="source" ref="1056307265"/>
+						<reference key="destination" ref="789215370"/>
+						<object class="NSNibBindingConnector" key="connector">
+							<reference key="NSSource" ref="1056307265"/>
+							<reference key="NSDestination" ref="789215370"/>
+							<string key="NSLabel">value: values.volume</string>
+							<string key="NSBinding">value</string>
+							<string key="NSKeyPath">values.volume</string>
+							<int key="NSNibBindingConnectorVersion">2</int>
+						</object>
+					</object>
+					<int key="connectionID">639</int>
+				</object>
 			</array>
 			<object class="IBMutableOrderedSet" key="objectRecords">
 				<array key="orderedObjects">
@@ -3519,6 +3598,7 @@ AAEAAQAAAT0AAwAAAAEAAgAAAVIAAwAAAAEAAQAAAVMAAwAAAAIAAQABAAAAAA</bytes>
 							<reference ref="911163514"/>
 							<reference ref="405021031"/>
 							<reference ref="319967180"/>
+							<reference ref="760683990"/>
 						</array>
 						<reference key="parent" ref="972006081"/>
 					</object>
@@ -3642,8 +3722,29 @@ AAEAAQAAAT0AAwAAAAEAAgAAAVIAAwAAAAEAAQAAAVMAAwAAAAIAAQABAAAAAA</bytes>
 						<reference key="parent" ref="0"/>
 					</object>
 					<object class="IBObjectRecord">
-						<int key="objectID">582</int>
-						<reference key="object" ref="346086284"/>
+						<int key="objectID">598</int>
+						<reference key="object" ref="760683990"/>
+						<array class="NSMutableArray" key="children">
+							<reference ref="1056307265"/>
+						</array>
+						<reference key="parent" ref="1046718163"/>
+					</object>
+					<object class="IBObjectRecord">
+						<int key="objectID">596</int>
+						<reference key="object" ref="1056307265"/>
+						<array class="NSMutableArray" key="children">
+							<reference ref="279183685"/>
+						</array>
+						<reference key="parent" ref="760683990"/>
+					</object>
+					<object class="IBObjectRecord">
+						<int key="objectID">597</int>
+						<reference key="object" ref="279183685"/>
+						<reference key="parent" ref="1056307265"/>
+					</object>
+					<object class="IBObjectRecord">
+						<int key="objectID">620</int>
+						<reference key="object" ref="568888154"/>
 						<reference key="parent" ref="0"/>
 					</object>
 				</array>
@@ -3708,6 +3809,7 @@ AAEAAQAAAT0AAwAAAAEAAgAAAVIAAwAAAAEAAQAAAVMAAwAAAAIAAQABAAAAAA</bytes>
 				<string key="350.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
 				<string key="351.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
 				<string key="354.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
+				<string key="371.IBPersistedLastKnownCanvasPosition">{359.5, 917.5}</string>
 				<string key="371.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
 				<string key="371.IBWindowTemplateEditedContentRect">{{422, 131}, {500, 371}}</string>
 				<integer value="1" key="371.NSWindowTemplate.visibleAtLaunch"/>
@@ -3811,7 +3913,10 @@ AAEAAQAAAT0AAwAAAAEAAgAAAVIAAwAAAAEAAQAAAVMAAwAAAAIAAQABAAAAAA</bytes>
 				<string key="57.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
 				<string key="58.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
 				<string key="580.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
-				<string key="582.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
+				<string key="596.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
+				<string key="597.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
+				<string key="598.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
+				<string key="620.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
 				<string key="72.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
 				<string key="73.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
 				<string key="74.IBPluginDependency">com.apple.InterfaceBuilder.CocoaPlugin</string>
@@ -3828,28 +3933,40 @@ AAEAAQAAAT0AAwAAAAEAAgAAAVIAAwAAAAEAAQAAAVMAAwAAAAIAAQABAAAAAA</bytes>
 			<nil key="activeLocalization"/>
 			<dictionary class="NSMutableDictionary" key="localizations"/>
 			<nil key="sourceID"/>
-			<int key="maxID">595</int>
+			<int key="maxID">639</int>
 		</object>
 		<object class="IBClassDescriber" key="IBDocument.Classes">
 			<array class="NSMutableArray" key="referencedPartialClassDescriptions">
+				<object class="IBPartialClassDescription">
+					<string key="className">FirstResponder</string>
+					<object class="IBClassDescriptionSource" key="sourceIdentifier">
+						<string key="majorKey">IBUserSource</string>
+						<string key="minorKey"/>
+					</object>
+				</object>
 				<object class="IBPartialClassDescription">
 					<string key="className">SpeakerAppDelegate</string>
 					<string key="superclassName">NSObject</string>
 					<dictionary class="NSMutableDictionary" key="actions">
 						<string key="seekBack:">id</string>
 						<string key="seekForward:">id</string>
+						<string key="setVolume:">NSSlider</string>
 						<string key="speakAction:">id</string>
 					</dictionary>
 					<dictionary class="NSMutableDictionary" key="actionInfosByName">
-						<object class="IBActionInfo" key="seekBack:">
+						<object class="IBActionInfo" key="seekBack:" id="812720436">
 							<string key="name">seekBack:</string>
 							<string key="candidateClassName">id</string>
 						</object>
-						<object class="IBActionInfo" key="seekForward:">
+						<object class="IBActionInfo" key="seekForward:" id="429231919">
 							<string key="name">seekForward:</string>
 							<string key="candidateClassName">id</string>
 						</object>
-						<object class="IBActionInfo" key="speakAction:">
+						<object class="IBActionInfo" key="setVolume:" id="259827734">
+							<string key="name">setVolume:</string>
+							<string key="candidateClassName">NSSlider</string>
+						</object>
+						<object class="IBActionInfo" key="speakAction:" id="451012767">
 							<string key="name">speakAction:</string>
 							<string key="candidateClassName">id</string>
 						</object>
@@ -3858,27 +3975,32 @@ AAEAAQAAAT0AAwAAAAEAAgAAAVIAAwAAAAEAAQAAAVMAAwAAAAIAAQABAAAAAA</bytes>
 						<string key="languageMenu">NSMenu</string>
 						<string key="languageMenuPopupButton">NSPopUpButton</string>
 						<string key="speakButton">NSToolbarItem</string>
+						<string key="synth">NSSpeechSynthesizer</string>
 						<string key="textView">NSTextView</string>
 						<string key="window">NSWindow</string>
 					</dictionary>
 					<dictionary class="NSMutableDictionary" key="toOneOutletInfosByName">
-						<object class="IBToOneOutletInfo" key="languageMenu">
+						<object class="IBToOneOutletInfo" key="languageMenu" id="94240548">
 							<string key="name">languageMenu</string>
 							<string key="candidateClassName">NSMenu</string>
 						</object>
-						<object class="IBToOneOutletInfo" key="languageMenuPopupButton">
+						<object class="IBToOneOutletInfo" key="languageMenuPopupButton" id="878011511">
 							<string key="name">languageMenuPopupButton</string>
 							<string key="candidateClassName">NSPopUpButton</string>
 						</object>
-						<object class="IBToOneOutletInfo" key="speakButton">
+						<object class="IBToOneOutletInfo" key="speakButton" id="207174429">
 							<string key="name">speakButton</string>
 							<string key="candidateClassName">NSToolbarItem</string>
 						</object>
-						<object class="IBToOneOutletInfo" key="textView">
+						<object class="IBToOneOutletInfo" key="synth" id="432188065">
+							<string key="name">synth</string>
+							<string key="candidateClassName">NSSpeechSynthesizer</string>
+						</object>
+						<object class="IBToOneOutletInfo" key="textView" id="212559543">
 							<string key="name">textView</string>
 							<string key="candidateClassName">NSTextView</string>
 						</object>
-						<object class="IBToOneOutletInfo" key="window">
+						<object class="IBToOneOutletInfo" key="window" id="962788542">
 							<string key="name">window</string>
 							<string key="candidateClassName">NSWindow</string>
 						</object>
@@ -3893,6 +4015,7 @@ AAEAAQAAAT0AAwAAAAEAAgAAAVIAAwAAAAEAAQAAAVMAAwAAAAIAAQABAAAAAA</bytes>
 					<dictionary class="NSMutableDictionary" key="actions">
 						<string key="seekBack:">id</string>
 						<string key="seekForward:">id</string>
+						<string key="setVolume:">NSSlider</string>
 						<string key="speakAction:">id</string>
 					</dictionary>
 					<dictionary class="NSMutableDictionary" key="actionInfosByName">
@@ -3904,6 +4027,10 @@ AAEAAQAAAT0AAwAAAAEAAgAAAVIAAwAAAAEAAQAAAVMAAwAAAAIAAQABAAAAAA</bytes>
 							<string key="name">seekForward:</string>
 							<string key="candidateClassName">id</string>
 						</object>
+						<object class="IBActionInfo" key="setVolume:">
+							<string key="name">setVolume:</string>
+							<string key="candidateClassName">NSSlider</string>
+						</object>
 						<object class="IBActionInfo" key="speakAction:">
 							<string key="name">speakAction:</string>
 							<string key="candidateClassName">id</string>
@@ -3914,11 +4041,51 @@ AAEAAQAAAT0AAwAAAAEAAgAAAVIAAwAAAAEAAQAAAVMAAwAAAAIAAQABAAAAAA</bytes>
 						<string key="minorKey">../SpeakerAppDelegate.m</string>
 					</object>
 				</object>
+				<object class="IBPartialClassDescription">
+					<string key="className">SpeakerAppDelegate</string>
+					<string key="superclassName">NSObject</string>
+					<dictionary class="NSMutableDictionary" key="actions">
+						<string key="seekBack:">id</string>
+						<string key="seekForward:">id</string>
+						<string key="setVolume:">NSSlider</string>
+						<string key="speakAction:">id</string>
+					</dictionary>
+					<dictionary class="NSMutableDictionary" key="actionInfosByName">
+						<reference key="seekBack:" ref="812720436"/>
+						<reference key="seekForward:" ref="429231919"/>
+						<reference key="setVolume:" ref="259827734"/>
+						<reference key="speakAction:" ref="451012767"/>
+					</dictionary>
+					<dictionary class="NSMutableDictionary" key="outlets">
+						<string key="languageMenu">NSMenu</string>
+						<string key="languageMenuPopupButton">NSPopUpButton</string>
+						<string key="speakButton">NSToolbarItem</string>
+						<string key="synth">NSSpeechSynthesizer</string>
+						<string key="textView">NSTextView</string>
+						<string key="window">NSWindow</string>
+					</dictionary>
+					<dictionary class="NSMutableDictionary" key="toOneOutletInfosByName">
+						<reference key="languageMenu" ref="94240548"/>
+						<reference key="languageMenuPopupButton" ref="878011511"/>
+						<reference key="speakButton" ref="207174429"/>
+						<reference key="synth" ref="432188065"/>
+						<reference key="textView" ref="212559543"/>
+						<reference key="window" ref="962788542"/>
+					</dictionary>
+					<object class="IBClassDescriptionSource" key="sourceIdentifier">
+						<string key="majorKey">IBProjectSource</string>
+						<string key="minorKey">./Classes/SpeakerAppDelegate.h</string>
+					</object>
+				</object>
 			</array>
 		</object>
 		<int key="IBDocument.localizationMode">0</int>
 		<string key="IBDocument.TargetRuntimeIdentifier">IBCocoaFramework</string>
 		<bool key="IBDocument.previouslyAttemptedUpgradeToXcode5">NO</bool>
+		<object class="NSMutableDictionary" key="IBDocument.PluginDeclaredDependencyDefaults">
+			<string key="NS.key.0">com.apple.InterfaceBuilder.CocoaPlugin.macosx</string>
+			<real value="101000" key="NS.object.0"/>
+		</object>
 		<object class="NSMutableDictionary" key="IBDocument.PluginDeclaredDevelopmentDependencies">
 			<string key="NS.key.0">com.apple.InterfaceBuilder.CocoaPlugin.InterfaceBuilder3</string>
 			<integer value="4600" key="NS.object.0"/>
diff --git a/SpeakerAppDelegate.h b/SpeakerAppDelegate.h
index fb1fbe4..9f87f6f 100644
--- a/SpeakerAppDelegate.h
+++ b/SpeakerAppDelegate.h
@@ -13,7 +13,6 @@
 	NSTextView *textView;
     NSMenu *__weak languageMenu;
     NSPopUpButton *__weak languageMenuPopupButton;
-	NSSpeechSynthesizer *synth;
 	NSRange oldRange;
 	BOOL isNewLocation;
     NSArray *languages;
@@ -24,10 +23,12 @@
 @property (weak) IBOutlet NSMenu *languageMenu;
 @property (weak) IBOutlet NSPopUpButton *languageMenuPopupButton;
 @property (weak) IBOutlet NSToolbarItem *speakButton;
+@property (weak) IBOutlet NSSpeechSynthesizer *synth;
 
 -(IBAction)speakAction:(id)sender;
 -(IBAction)seekForward:(id)sender;
 -(IBAction)seekBack:(id)sender;
+-(IBAction)setVolume:(NSSlider *)sender;
 
 -(void)stopSpeaking;
 -(void)startSpeaking;
diff --git a/SpeakerAppDelegate.m b/SpeakerAppDelegate.m
index 4c30f3b..2687c81 100644
--- a/SpeakerAppDelegate.m
+++ b/SpeakerAppDelegate.m
@@ -16,12 +16,11 @@
 @synthesize languageMenu;
 @synthesize languageMenuPopupButton;
 @synthesize speakButton;
+@synthesize synth;
 
 @synthesize window, textView;
 
 - (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
-	// Insert code here to initialize your application 
-	synth = [[NSSpeechSynthesizer alloc] init];
 	synth.delegate = self;
 	oldRange = NSMakeRange(-1, -1);
 	isNewLocation = YES;
@@ -37,6 +36,13 @@
 		[textView scrollRangeToVisible:aRange];
 	}
     
+    float volume = [defaults floatForKey:@"volume"];
+    if (volume == 0.0) {
+        synth.volume = 1.0;
+    } else {
+        synth.volume = volume / 100;
+    }
+    
     [self initLanugageMenu];
 }
 
@@ -126,6 +132,8 @@
 }
 
 -(void)startSpeaking {
+    
+    [synth stopSpeaking];
 	
 	[textView setEditable:NO];
 	
@@ -145,13 +153,9 @@
 	} else { // only pointer
 		text = [wholeText substringWithRange:NSMakeRange(range.location, [wholeText length] - range.location)];
 	}
-	
-	[synth stopSpeaking];
     
     [self setVoiceForLanguage:[self findLanguageFromString:text]];
-    
     [synth startSpeakingString:text];
-	
 	oldRange = range;
 	
 }
@@ -173,6 +177,19 @@
 
 }
 
+- (IBAction)setVolume:(NSSlider *)sender {
+    BOOL restart = NO;
+    if ([synth isSpeaking]) {
+        restart = YES;
+        [self stopSpeaking];
+    }
+    synth.volume = sender.floatValue / 100;
+    
+    if (restart) {
+        [self startSpeaking];
+    }
+}
+
 - (void)speechSynthesizer:(NSSpeechSynthesizer *)sender willSpeakWord:(NSRange)wordToSpeak ofString:(NSString *)text {
 	NSRange range = NSMakeRange(oldRange.location + wordToSpeak.location, wordToSpeak.length);
 	[textView scrollRangeToVisible:range];
@@ -194,7 +211,7 @@
 {
     NSArray *tagschemes = [NSArray arrayWithObjects:NSLinguisticTagSchemeLanguage, nil];
     NSLinguisticTagger *tagger = [[NSLinguisticTagger alloc] initWithTagSchemes:tagschemes options:0];
-    [tagger setString:text];
+    [tagger setString:[[[text componentsSeparatedByCharactersInSet:[[NSCharacterSet letterCharacterSet] invertedSet]] componentsJoinedByString:@" "] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]];
     NSString *language = [tagger tagAtIndex:0 scheme:NSLinguisticTagSchemeLanguage tokenRange:NULL sentenceRange:NULL];
     
     return language;