diff --git a/TAAESample.xcodeproj/project.pbxproj b/TAAESample.xcodeproj/project.pbxproj
index 17698dd..7b09f24 100644
--- a/TAAESample.xcodeproj/project.pbxproj
+++ b/TAAESample.xcodeproj/project.pbxproj
@@ -188,6 +188,7 @@
 				4CDCACBD1CA25AA8008AAEF1 /* Products */,
 			);
 			sourceTree = "<group>";
+			usesTabs = 0;
 		};
 		4CDCACBD1CA25AA8008AAEF1 /* Products */ = {
 			isa = PBXGroup;
diff --git a/TAAESample/Platform/macOS/Classes/AppDelegate.swift b/TAAESample/Platform/macOS/Classes/AppDelegate.swift
index 3ef5bc2..8f384b5 100644
--- a/TAAESample/Platform/macOS/Classes/AppDelegate.swift
+++ b/TAAESample/Platform/macOS/Classes/AppDelegate.swift
@@ -17,7 +17,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
         self.audio = AEAudioController();
         do {
             try self.audio!.start();
-            if let viewController = NSApplication.sharedApplication().mainWindow?.contentViewController as? ViewController {
+            if let viewController = NSApplication.shared.mainWindow?.contentViewController as? ViewController {
                 viewController.audio = self.audio
             }
         } catch {
diff --git a/TAAESample/Platform/macOS/Classes/ViewController.swift b/TAAESample/Platform/macOS/Classes/ViewController.swift
index 87c49d2..64a40d1 100644
--- a/TAAESample/Platform/macOS/Classes/ViewController.swift
+++ b/TAAESample/Platform/macOS/Classes/ViewController.swift
@@ -18,7 +18,7 @@ class ViewController: NSViewController {
         // Do any additional setup after loading the view.
     }
 
-    override var representedObject: AnyObject? {
+    override var representedObject: Any? {
         didSet {
         // Update the view, if already loaded.
         }
diff --git a/TheAmazingAudioEngine.xcodeproj/project.pbxproj b/TheAmazingAudioEngine.xcodeproj/project.pbxproj
index 29d1cba..7479696 100644
--- a/TheAmazingAudioEngine.xcodeproj/project.pbxproj
+++ b/TheAmazingAudioEngine.xcodeproj/project.pbxproj
@@ -529,6 +529,7 @@
 				4CDCAC991CA25A29008AAEF1 /* Products */,
 			);
 			sourceTree = "<group>";
+			usesTabs = 0;
 		};
 		4CDCAC991CA25A29008AAEF1 /* Products */ = {
 			isa = PBXGroup;
@@ -1188,6 +1189,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				COMBINE_HIDPI_IMAGES = YES;
+				MACOSX_DEPLOYMENT_TARGET = 10.11;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
@@ -1198,6 +1200,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				COMBINE_HIDPI_IMAGES = YES;
+				MACOSX_DEPLOYMENT_TARGET = 10.11;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
diff --git a/TheAmazingAudioEngine/Modules/Processing/AEDynamicsProcessorModule.m b/TheAmazingAudioEngine/Modules/Processing/AEDynamicsProcessorModule.m
index 01e53ba..5f2bafd 100644
--- a/TheAmazingAudioEngine/Modules/Processing/AEDynamicsProcessorModule.m
+++ b/TheAmazingAudioEngine/Modules/Processing/AEDynamicsProcessorModule.m
@@ -61,7 +61,12 @@ - (double)releaseTime {
 }
 
 - (double)masterGain {
-    return [self getParameterValueForId:kDynamicsProcessorParam_OverallGain];
+    if ( @available(iOS 15.0, macOS 12.0, *) ) {
+        return [self getParameterValueForId:6];
+    }
+    else {
+        return [self getParameterValueForId:kDynamicsProcessorParam_MasterGain];
+    }
 }
 
 - (double)compressionAmount {
@@ -110,8 +115,14 @@ - (void)setReleaseTime:(double)releaseTime {
 }
 
 - (void)setMasterGain:(double)masterGain {
-    [self setParameterValue: masterGain
-                      forId: kDynamicsProcessorParam_OverallGain];
+    if ( @available(iOS 15.0, macOS 12.0, *) ) {
+        [self setParameterValue: masterGain
+                          forId: 6];
+    }
+    else {
+        [self setParameterValue: masterGain
+                          forId: kDynamicsProcessorParam_MasterGain];
+    }
 }
 
 @end
diff --git a/TheAmazingAudioEngine/Outputs/AEAudioUnitOutput.m b/TheAmazingAudioEngine/Outputs/AEAudioUnitOutput.m
index e27cc74..9a35cc8 100644
--- a/TheAmazingAudioEngine/Outputs/AEAudioUnitOutput.m
+++ b/TheAmazingAudioEngine/Outputs/AEAudioUnitOutput.m
@@ -259,7 +259,7 @@ static void AEAudioUnitOutputReportRenderTime(__unsafe_unretained AEAudioUnitOut
     
     if ( now - THIS->_firstReportTime > kRenderBudgetWarningInitialDelay
             && renderTime > bufferDuration * kRenderBudgetWarningThreshold ) {
-        if ( @available(iOS 12, *) ) {
+        if ( @available(iOS 12, macOS 10.14, *) ) {
             os_signpost_event_emit(THIS->_log, OS_SIGNPOST_ID_EXCLUSIVE, "Overrun");
         }
         dispatch_async(dispatch_get_main_queue(), ^{
diff --git a/TheAmazingAudioEngine/Utilities/AEIOAudioUnit.m b/TheAmazingAudioEngine/Utilities/AEIOAudioUnit.m
index e0c0e2c..b17807a 100644
--- a/TheAmazingAudioEngine/Utilities/AEIOAudioUnit.m
+++ b/TheAmazingAudioEngine/Utilities/AEIOAudioUnit.m
@@ -39,7 +39,9 @@
 NSString * const AEIOAudioUnitSessionInterruptionBeganNotification = @"AEIOAudioUnitSessionInterruptionBeganNotification";
 NSString * const AEIOAudioUnitSessionInterruptionEndedNotification = @"AEIOAudioUnitSessionInterruptionEndedNotification";
 
+#if TARGET_OS_IPHONE
 static const double kAVAudioSession0dBGain = 0.75;
+#endif
 
 @interface AEIOAudioUnit ()
 @property (nonatomic, strong) AEManagedValue * renderBlockValue;