diff --git a/Base.lproj/AdvancedPrefsViewController.xib b/Base.lproj/AdvancedPrefsViewController.xib
index 7e48aa9..e37781e 100755
--- a/Base.lproj/AdvancedPrefsViewController.xib
+++ b/Base.lproj/AdvancedPrefsViewController.xib
@@ -183,14 +183,33 @@
                             </connections>
                         </popUpButton>
                         <textField focusRingType="none" verticalHuggingPriority="750" preferredMaxLayoutWidth="400" translatesAutoresizingMaskIntoConstraints="NO" id="hgg-QV-i0I">
-                            <rect key="frame" x="18" y="294" width="133" height="16"/>
+                            <rect key="frame" x="18" y="314" width="133" height="16"/>
                             <textFieldCell key="cell" sendsActionOnEndEditing="YES" alignment="right" title="Alternate Groups:" id="agM-jg-8mH">
                                 <font key="font" metaFont="system"/>
                                 <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
                                 <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
                             </textFieldCell>
                         </textField>
+                        <textField focusRingType="none" verticalHuggingPriority="750" preferredMaxLayoutWidth="400" translatesAutoresizingMaskIntoConstraints="NO" id="exotic-audio-label">
+                            <rect key="frame" x="18" y="132" width="133" height="16"/>
+                            <textFieldCell key="cell" sendsActionOnEndEditing="YES" alignment="right" title="Exotic audio:" id="exotic-audio-label-cell">
+                                <font key="font" metaFont="system"/>
+                                <color key="textColor" name="controlTextColor" catalog="System" colorSpace="catalog"/>
+                                <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
+                            </textFieldCell>
+                        </textField>
+                        <button verticalHuggingPriority="750" horizontalCompressionResistancePriority="1000" verticalCompressionResistancePriority="1000" translatesAutoresizingMaskIntoConstraints="NO" id="exotic-audio-checkbox">
+                            <rect key="frame" x="155" y="131" width="263" height="18"/>
+                            <buttonCell key="cell" type="check" title="Disable multi-channel tracks by default" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="exotic-audio-checkbox-cell">
+                                <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
+                                <font key="font" metaFont="system"/>
+                            </buttonCell>
+                            <connections>
+                                <binding destination="3" name="value" keyPath="values.SBDisableExoticAudio" id="exotic-audio-binding"/>
+                            </connections>
+                        </button>
                         <button verticalHuggingPriority="750" horizontalCompressionResistancePriority="1000" verticalCompressionResistancePriority="1000" translatesAutoresizingMaskIntoConstraints="NO" id="QpA-Yd-jpF">
+                            <rect key="frame" x="155" y="291" width="238" height="18"/>
                             <rect key="frame" x="155" y="271" width="187" height="18"/>
                             <buttonCell key="cell" type="check" title="Infer media characteristics" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="86R-Dj-j6Y">
                                 <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -232,6 +251,7 @@
                             </connections>
                         </popUpButton>
                         <button verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="edJ-A5-eyf">
+                            <rect key="frame" x="172" y="162" width="92" height="18"/>
                             <rect key="frame" x="172" y="142" width="92" height="18"/>
                             <buttonCell key="cell" type="check" title="Keep AC-3" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="Zgy-z5-6UG">
                                 <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -285,13 +305,19 @@
                         <constraint firstItem="101" firstAttribute="leading" secondItem="hgg-QV-i0I" secondAttribute="leading" id="V5i-g6-rPa"/>
                         <constraint firstItem="olE-Dy-uJm" firstAttribute="leading" secondItem="101" secondAttribute="trailing" constant="8" id="Wck-0t-JIW"/>
                         <constraint firstItem="Pud-GM-vyU" firstAttribute="leading" secondItem="189" secondAttribute="leading" id="Wxi-ZW-QRQ"/>
-                        <constraint firstItem="115" firstAttribute="top" secondItem="edJ-A5-eyf" secondAttribute="bottom" constant="20" id="ZB0-Ig-fhK"/>
+                        <constraint firstItem="115" firstAttribute="top" secondItem="edJ-A5-eyf" secondAttribute="bottom" constant="40" id="ZB0-Ig-fhK"/>
                         <constraint firstItem="hjZ-wQ-Sbb" firstAttribute="leading" secondItem="101" secondAttribute="trailing" constant="8" id="ZKS-d6-oJ6"/>
                         <constraint firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="edJ-A5-eyf" secondAttribute="trailing" constant="20" symbolic="YES" id="ZYM-ne-01S"/>
                         <constraint firstItem="olE-Dy-uJm" firstAttribute="top" secondItem="hjZ-wQ-Sbb" secondAttribute="bottom" constant="7" id="ZpI-qc-wxr"/>
                         <constraint firstItem="ETf-LE-57P" firstAttribute="leading" secondItem="Pud-GM-vyU" secondAttribute="trailing" constant="7" id="avr-Vp-M13"/>
                         <constraint firstItem="Z2f-U9-9ZT" firstAttribute="width" secondItem="Pud-GM-vyU" secondAttribute="width" id="cXa-gD-TzD"/>
                         <constraint firstItem="113" firstAttribute="width" secondItem="189" secondAttribute="width" id="dg6-kk-hDf"/>
+                        <constraint firstItem="exotic-audio-checkbox" firstAttribute="baseline" secondItem="exotic-audio-label" secondAttribute="baseline" id="exotic-audio-checkbox-baseline"/>
+                        <constraint firstItem="exotic-audio-checkbox" firstAttribute="leading" secondItem="exotic-audio-label" secondAttribute="trailing" constant="8" id="exotic-audio-checkbox-leading"/>
+                        <constraint firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="exotic-audio-checkbox" secondAttribute="trailing" constant="20" symbolic="YES" id="exotic-audio-checkbox-trailing"/>
+                        <constraint firstItem="exotic-audio-label" firstAttribute="leading" secondItem="hgg-QV-i0I" secondAttribute="leading" id="exotic-audio-label-leading"/>
+                        <constraint firstItem="exotic-audio-label" firstAttribute="top" secondItem="edJ-A5-eyf" secondAttribute="bottom" constant="15" id="exotic-audio-label-top"/>
+                        <constraint firstItem="exotic-audio-label" firstAttribute="width" secondItem="hgg-QV-i0I" secondAttribute="width" id="exotic-audio-label-width"/>
                         <constraint firstItem="191" firstAttribute="baseline" secondItem="201" secondAttribute="baseline" id="fjE-Sl-C45"/>
                         <constraint firstItem="rmU-Gb-jzF" firstAttribute="top" secondItem="olE-Dy-uJm" secondAttribute="bottom" constant="5" id="hEg-lY-NlJ"/>
                         <constraint firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="fTk-UL-aoX" secondAttribute="trailing" constant="20" symbolic="YES" id="hvb-cB-oAO"/>
diff --git a/Classes/Document.swift b/Classes/Document.swift
index 7c1ac11..8b9b9de 100644
--- a/Classes/Document.swift
+++ b/Classes/Document.swift
@@ -60,7 +60,21 @@ final class Document: NSDocument {
     override func read(from url: URL, ofType typeName: String) throws {
         do {
             mp4 = try MP42File(url: url)
+            // Check if this is an AAC file with more than 2 channels that needs downmixing
+            for track in mp4.tracks {
+                if let audioTrack = track as? MP42AudioTrack,
+                   audioTrack.format == kMP42AudioCodecType_MPEG4AAC,
+                   audioTrack.channels > 2,
+                   audioTrack.fallbackTrack == nil,
+                   Prefs.audioMixdown != 0 {
+                    // Clear the mp4 property and mark as unsupported
+                    mp4 = MP42File()
+                    unsupportedMp4Brand = true
+                }
+            }
         } catch {
+            // Clear the mp4 property when marking as unsupported
+            mp4 = MP42File()
             unsupportedMp4Brand = true
         }
     }
diff --git a/Classes/FileImportController.swift b/Classes/FileImportController.swift
index 90dffd7..474b869 100644
--- a/Classes/FileImportController.swift
+++ b/Classes/FileImportController.swift
@@ -124,6 +124,17 @@ final class FileImportController: ViewController, NSTableViewDataSource, NSTable
                                                 tag: 6,
                                                 enabled: true)
                     actions.append(conversionAction)
+                    let conversionAction2 = Action(title: NSLocalizedString("AAC + AC3", comment: "File Import action menu item."),
+                                                tag: 7,
+                                                enabled: true)
+                    actions.append(conversionAction2)
+                }
+
+                if (track.format == kMP42AudioCodecType_Opus || track.format == kMP42AudioCodecType_TrueHD) && channelCount > 2 {
+                    let conversionAction = Action(title: NSLocalizedString("AAC + AC3", comment: "File Import action menu item."),
+                                                tag: 7,
+                                                enabled: true)
+                    actions.append(conversionAction)
                 }
                 
             default:
@@ -132,13 +143,44 @@ final class FileImportController: ViewController, NSTableViewDataSource, NSTable
             self.actions = actions
 
             // Set the action menu selection
+            // AAC, 6 channel Specific actions
+            if track.format == kMP42AudioCodecType_MPEG4AAC,
+               let audioTrack = track as? MP42AudioTrack,
+               audioTrack.channels > 2,
+               Prefs.audioMixdown != 0 {
+                // This handles AAC, 6 ch without any fallback stereo track
+                if audioTrack.fallbackTrack != nil {
+                    self.selectedActionTag = 0 // Passthru
+                } else {
+                    self.selectedActionTag = 7 // AAC + AC3
+                }
+            }
+
+            // Exotic audio Specific actions
+            else if (track.format == kMP42AudioCodecType_Opus || track.format == kMP42AudioCodecType_TrueHD),
+                let audioTrack = track as? MP42AudioTrack {
+                if audioTrack.channels > 2 {
+                    if Prefs.disableExoticAudio {
+                        // If multi-channelexotic audio is disabled, we default to off and AAC - Multichannel
+                        self.checked = false
+                        self.selectedActionTag = 5 // AAC - Multichannel
+                    } else {
+                        // If multi-channel exotic audio is enabled, we default to AAC + AC3
+                        self.selectedActionTag = 7 // AAC + AC3
+                    }
+                } else {
+                    // Otherwise, default to AAC - Stereo
+                    self.selectedActionTag = 3 // AAC - Stereo 
+                }
+            }
+
             // AC-3 Specific actions
-            if (track.format == kMP42AudioCodecType_AC3 || track.format == kMP42AudioCodecType_EnhancedAC3) &&
+            else if (track.format == kMP42AudioCodecType_AC3 || track.format == kMP42AudioCodecType_EnhancedAC3) &&
                 Prefs.audioConvertAC3, let audioTrack = track as? MP42AudioTrack {
                 if Prefs.audioKeepAC3 && audioTrack.fallbackTrack == nil {
-                    self.selectedActionTag = 6
+                    self.selectedActionTag = 6 // AAC + Passthru
                 } else if audioTrack.fallbackTrack != nil {
-                    self.selectedActionTag = 0
+                    self.selectedActionTag = 0 // Passthru
                 } else {
                     self.selectedActionTag = Prefs.audioMixdown
                 }
@@ -147,7 +189,7 @@ final class FileImportController: ViewController, NSTableViewDataSource, NSTable
             else if track.format == kMP42AudioCodecType_DTS &&
                 Prefs.audioConvertDts, let audioTrack = track as? MP42AudioTrack {
                 if audioTrack.fallbackTrack != nil {
-                    self.selectedActionTag = 0
+                    self.selectedActionTag = 0 // Passthru
                 }
                 else {
                     switch Prefs.audioDtsOptions {
@@ -159,18 +201,18 @@ final class FileImportController: ViewController, NSTableViewDataSource, NSTable
             }
             // Vobsub
             else if track.format == kMP42SubtitleCodecType_VobSub && Prefs.subtitleConvertBitmap {
-                self.selectedActionTag = 1
+                self.selectedActionTag = 1 // Tx3g
             }
             // Generic actions
             else if needsConversion {
                 if track is MP42AudioTrack {
                     self.selectedActionTag = Prefs.audioMixdown
                 } else {
-                    self.selectedActionTag = 1
+                    self.selectedActionTag = 1 // Tx3g
                 }
             }
             else {
-                self.selectedActionTag = 0
+                self.selectedActionTag = 0 // Passthru
             }
         }
     }
diff --git a/Classes/Prefs.swift b/Classes/Prefs.swift
index 290ad15..2f50b59 100644
--- a/Classes/Prefs.swift
+++ b/Classes/Prefs.swift
@@ -78,7 +78,7 @@ enum Prefs {
                                _audioBitrate, _audioDRC, _audioConvertAC3, _audioKeepAC3, _audioConvertDts,
                                _audioDtsOptions, _subtitleConvertBitmap, _ratingsCountry, _chaptersPreviewPosition,
                                _chaptersPreviewTrack, _mp464bitOffset, _mp464bitTimes, _mp4SaveAsOptimize, _forceHvc1,
-                               _logFormat])
+                               _logFormat,_disableExoticAudio])
     }
 
     @Stored(key: "NSApplicationCrashOnException", defaultValue: true)
@@ -161,6 +161,9 @@ enum Prefs {
 
     @Stored(key: "SBLogFormat", defaultValue: 0)
     static var logFormat: Int  // 0 = Time Only, 1 = Date and Time
+
+    @Stored(key: "SBDisableExoticAudio", defaultValue: true)
+    static var disableExoticAudio: Bool
 }
 
 enum MetadataPrefs {
diff --git a/Classes/QueueItem.swift b/Classes/QueueItem.swift
index 3effaf1..8bedace 100644
--- a/Classes/QueueItem.swift
+++ b/Classes/QueueItem.swift
@@ -158,6 +158,20 @@ import MP42Foundation
         }
     }
 
+    private func downmixAudio(track: MP42AudioTrack) -> MP42AudioTrack {
+        let bitrate = Prefs.audioBitrate
+        let drc = Prefs.audioDRC
+        let mixdown = MP42AudioMixdown(Prefs.audioMixdown)
+
+        // Create a copy for downmixing
+        let copy = track.copy() as! MP42AudioTrack
+        let settings1 = MP42AudioConversionSettings(format: kMP42AudioCodecType_MPEG4AAC, bitRate: bitrate, mixDown: mixdown, drc: drc)
+        copy.conversionSettings = settings1
+        copy.isEnabled = true
+        track.fallbackTrack = copy
+        return copy
+    }
+
     private func configureAudio(track: MP42AudioTrack, mp4: MP42File) {
         var conversionNeeded = false
 
@@ -165,17 +179,47 @@ import MP42Foundation
         let drc = Prefs.audioDRC
         let mixdown = MP42AudioMixdown(Prefs.audioMixdown)
 
+        // Handle exotic audio tracks
+        if (track.format == kMP42AudioCodecType_TrueHD || track.format == kMP42AudioCodecType_Opus) && !Prefs.disableExoticAudio {
+            // If we want to convert True HD or Opus to AAC, we can do so this way
+            if track.channels > 2 && mixdown != kMP42AudioMixdown_None {
+                // Create a copy for downmixing
+                let copy = downmixAudio(track: track)
+                track.isEnabled = false
+
+                mp4.addTrack(copy)
+            }
+
+            // Set up the original track with conversion settings
+            let settings = MP42AudioConversionSettings(format: kMP42AudioCodecType_AC3, bitRate: bitrate, mixDown: kMP42AudioMixdown_None, drc: drc)
+            track.conversionSettings = settings
+
+            return
+        }
+
+        // AAC track handling
+        if track.format == kMP42AudioCodecType_MPEG4AAC && track.channels > 2 && track.fallbackTrack == nil {
+            if mixdown != kMP42AudioMixdown_None {
+                // Create a copy for downmixing
+                let copy = downmixAudio(track: track)
+                track.isEnabled = false
+
+                mp4.addTrack(copy)
+            } else {
+                // If no downmixing is requested, just pass through the original track
+                track.isEnabled = true
+            }
+            // Set up the original track with conversion settings
+            let settings = MP42AudioConversionSettings(format: kMP42AudioCodecType_AC3, bitRate: bitrate, mixDown: kMP42AudioMixdown_None, drc: drc)
+            track.conversionSettings = settings
+        }
         // AC-3 track, we might need to do the aac + ac3 trick.
-        if track.format == kMP42AudioCodecType_AC3 ||
+        else if track.format == kMP42AudioCodecType_AC3 ||
             track.format == kMP42AudioCodecType_EnhancedAC3 {
 
             if Prefs.audioConvertAC3 {
                 if Prefs.audioKeepAC3 && track.fallbackTrack == nil {
-                    let copy = track.copy() as! MP42AudioTrack
-                    let settings = MP42AudioConversionSettings(format: kMP42AudioCodecType_MPEG4AAC, bitRate: bitrate, mixDown: mixdown, drc: drc)
-                    copy.conversionSettings = settings
-
-                    track.fallbackTrack = copy
+                    let copy = downmixAudio(track: track)
                     track.isEnabled = false
 
                     mp4.addTrack(copy)
@@ -190,11 +234,7 @@ import MP42Foundation
                 switch Prefs.audioDtsOptions {
                 case 1: // Convert to AC-3
 
-                    let copy = track.copy() as! MP42AudioTrack
-                    let settings = MP42AudioConversionSettings(format: kMP42AudioCodecType_MPEG4AAC, bitRate: bitrate, mixDown: mixdown, drc: drc)
-                    copy.conversionSettings = settings
-
-                    track.fallbackTrack = copy
+                    let copy = downmixAudio(track: track)
                     track.isEnabled = false
 
                     // Wouldn't it be better to use pref settings too instead of 640/Multichannel and the drc from the prefs?
@@ -204,11 +244,7 @@ import MP42Foundation
 
                 case 2: // Keep DTS
 
-                    let copy = track.copy() as! MP42AudioTrack
-                    let settings = MP42AudioConversionSettings(format: kMP42AudioCodecType_MPEG4AAC, bitRate: bitrate, mixDown: mixdown, drc: drc)
-                    copy.conversionSettings = settings
-
-                    track.fallbackTrack = copy
+                    let copy = downmixAudio(track: track)
                     track.isEnabled = false
 
                     mp4.addTrack(copy)
@@ -256,7 +292,32 @@ import MP42Foundation
             let value = try? fileURL.resourceValues(forKeys: [URLResourceKey.typeIdentifierKey])
 
             if let type = value?.typeIdentifier, type == "com.apple.m4a-audio" || type == "com.apple.m4v-video" || type == "public.mpeg-4" {
+                // Create MP42File and configure audio tracks
                 mp4File = try MP42File(url: fileURL)
+                if let mp4 = mp4File {
+                    // Collect tracks to remove
+                    var tracksToRemove: [MP42Track] = []
+
+                    // Configure audio tracks for existing MP4 files
+                    for track in mp4.tracks {
+                        if let audioTrack = track as? MP42AudioTrack {
+                            if (Prefs.disableExoticAudio && (audioTrack.format == kMP42AudioCodecType_TrueHD || (audioTrack.format == kMP42AudioCodecType_Opus && audioTrack.channels > 2))) {
+                                // Add exotic audio tracks to removal list
+                                tracksToRemove.append(audioTrack)
+                            } else if audioTrack.format == kMP42AudioCodecType_MPEG4AAC &&
+                                      audioTrack.channels > 2 &&
+                                      audioTrack.fallbackTrack == nil &&
+                                      Prefs.audioMixdown != 0 {
+                                configureAudio(track: audioTrack, mp4: mp4)
+                            }
+                        }
+                    }
+
+                    // Remove collected tracks after processing
+                    if !tracksToRemove.isEmpty {
+                        mp4.removeTracks(tracksToRemove)
+                    }
+                }
             } else {
                 let mp4 = MP42File()
                 let importer = try MP42FileImporter(url: fileURL)
@@ -264,16 +325,28 @@ import MP42Foundation
 
                 mp4.metadata.merge(importer.metadata)
 
-                for track in activeTracks {
+                // Collect tracks to remove
+                var tracksToRemove: [MP42Track] = []
 
-                    if let track = track as? MP42AudioTrack {
-                        configureAudio(track: track, mp4: mp4)
+                for track in activeTracks {
+                    if let audioTrack = track as? MP42AudioTrack {
+                        if (Prefs.disableExoticAudio && (audioTrack.format == kMP42AudioCodecType_TrueHD || (audioTrack.format == kMP42AudioCodecType_Opus && audioTrack.channels > 2))) {
+                            // Add exotic audio tracks to removal list
+                            tracksToRemove.append(audioTrack)
+                        }
+                        configureAudio(track: audioTrack, mp4: mp4)
                     } else if let track = track as? MP42SubtitleTrack {
                         configureSubtitles(track: track, mp4: mp4)
                     }
 
                     mp4.addTrack(track)
                 }
+
+                // Remove collected tracks after processing
+                if !tracksToRemove.isEmpty {
+                    mp4.removeTracks(tracksToRemove)
+                }
+                
                 mp4File = mp4
             }
         }