diff --git a/SabreTools.Data.Extensions/MetadataExtensions.cs b/SabreTools.Data.Extensions/MetadataExtensions.cs
index 89b1116e..77d4714f 100644
--- a/SabreTools.Data.Extensions/MetadataExtensions.cs
+++ b/SabreTools.Data.Extensions/MetadataExtensions.cs
@@ -369,6 +369,10 @@ namespace SabreTools.Data.Extensions
                 cloneSoftwareList.Status = selfSoftwareList.Status;
                 cloneSoftwareList.Tag = selfSoftwareList.Tag;
             }
+            else if (self is Sound selfSound && clone is Sound cloneSound)
+            {
+                cloneSound.Channels = selfSound.Channels;
+            }
             else if (self is Video selfVideo && clone is Video cloneVideo)
             {
                 cloneVideo.Screen = selfVideo.Screen;
diff --git a/SabreTools.Data.Models/ClrMamePro/Sound.cs b/SabreTools.Data.Models/ClrMamePro/Sound.cs
index 4af5f9ce..1ffa6fc0 100644
--- a/SabreTools.Data.Models/ClrMamePro/Sound.cs
+++ b/SabreTools.Data.Models/ClrMamePro/Sound.cs
@@ -6,6 +6,6 @@ namespace SabreTools.Data.Models.ClrMamePro
     {
         /// <remarks>channels, Numeric?</remarks>
         [Required]
-        public string? Channels { get; set; }
+        public long? Channels { get; set; }
     }
 }
diff --git a/SabreTools.Data.Models/Listxml/Sound.cs b/SabreTools.Data.Models/Listxml/Sound.cs
index 7f616c72..2600d84c 100644
--- a/SabreTools.Data.Models/Listxml/Sound.cs
+++ b/SabreTools.Data.Models/Listxml/Sound.cs
@@ -9,6 +9,6 @@ namespace SabreTools.Data.Models.Listxml
         /// <remarks>Numeric</remarks>
         [Required]
         [XmlAttribute("channels")]
-        public string? Channels { get; set; }
+        public long? Channels { get; set; }
     }
 }
diff --git a/SabreTools.Data.Models/Metadata/Sound.cs b/SabreTools.Data.Models/Metadata/Sound.cs
index 480d1537..2d14fee5 100644
--- a/SabreTools.Data.Models/Metadata/Sound.cs
+++ b/SabreTools.Data.Models/Metadata/Sound.cs
@@ -6,10 +6,9 @@ namespace SabreTools.Data.Models.Metadata
     [JsonObject("sound"), XmlRoot("sound")]
     public class Sound : DatItem
     {
-        #region Keys
+        #region Properties
 
-        /// <remarks>long</remarks>
-        public const string ChannelsKey = "channels";
+        public long? Channels { get; set; }
 
         #endregion
 
diff --git a/SabreTools.Metadata.DatFiles.Test/DatFileTests.FromMetadata.cs b/SabreTools.Metadata.DatFiles.Test/DatFileTests.FromMetadata.cs
index 7bbcd309..947c6f36 100644
--- a/SabreTools.Metadata.DatFiles.Test/DatFileTests.FromMetadata.cs
+++ b/SabreTools.Metadata.DatFiles.Test/DatFileTests.FromMetadata.cs
@@ -961,7 +961,7 @@ namespace SabreTools.Metadata.DatFiles.Test
         {
             return new Data.Models.Metadata.Sound
             {
-                [Data.Models.Metadata.Sound.ChannelsKey] = 12345L,
+                Channels = 12345L,
             };
         }
 
@@ -1635,7 +1635,7 @@ namespace SabreTools.Metadata.DatFiles.Test
         private static void ValidateSound(Sound? sound)
         {
             Assert.NotNull(sound);
-            Assert.Equal(12345L, sound.ReadLong(Data.Models.Metadata.Sound.ChannelsKey));
+            Assert.Equal(12345L, sound.Channels);
         }
 
         // TODO: Figure out why so many fields are omitted
diff --git a/SabreTools.Metadata.DatFiles.Test/DatFileTests.ToMetadata.cs b/SabreTools.Metadata.DatFiles.Test/DatFileTests.ToMetadata.cs
index 9345937e..d12014b2 100644
--- a/SabreTools.Metadata.DatFiles.Test/DatFileTests.ToMetadata.cs
+++ b/SabreTools.Metadata.DatFiles.Test/DatFileTests.ToMetadata.cs
@@ -1200,7 +1200,7 @@ namespace SabreTools.Metadata.DatFiles.Test
         private static void ValidateMetadataSound(Data.Models.Metadata.Sound? sound)
         {
             Assert.NotNull(sound);
-            Assert.Equal(12345, sound.ReadLong(Data.Models.Metadata.Sound.ChannelsKey));
+            Assert.Equal(12345, sound.Channels);
         }
 
         private static void ValidateMetadataSourceDetails(Data.Models.Metadata.SourceDetails? sourceDetails)
diff --git a/SabreTools.Metadata.DatFiles.Test/FormatsTests.cs b/SabreTools.Metadata.DatFiles.Test/FormatsTests.cs
index 35439552..5e0d3f74 100644
--- a/SabreTools.Metadata.DatFiles.Test/FormatsTests.cs
+++ b/SabreTools.Metadata.DatFiles.Test/FormatsTests.cs
@@ -215,7 +215,7 @@ namespace SabreTools.Metadata.DatFiles.Test
 
             Assert.NotNull(actual);
             Assert.True(actual.SequenceEqual([
-                Data.Models.Metadata.Sound.ChannelsKey,
+                nameof(Data.Models.Metadata.Sound.Channels),
             ]));
         }
 
@@ -894,7 +894,7 @@ namespace SabreTools.Metadata.DatFiles.Test
 
             Assert.NotNull(actual);
             Assert.True(actual.SequenceEqual([
-                Data.Models.Metadata.Sound.ChannelsKey,
+                nameof(Data.Models.Metadata.Sound.Channels),
             ]));
         }
 
diff --git a/SabreTools.Metadata.DatFiles/Formats/ClrMamePro.cs b/SabreTools.Metadata.DatFiles/Formats/ClrMamePro.cs
index e4f16d58..c11b02e0 100644
--- a/SabreTools.Metadata.DatFiles/Formats/ClrMamePro.cs
+++ b/SabreTools.Metadata.DatFiles/Formats/ClrMamePro.cs
@@ -147,8 +147,8 @@ namespace SabreTools.Metadata.DatFiles.Formats
                     break;
 
                 case Sound sound:
-                    if (sound.ReadLong(Data.Models.Metadata.Sound.ChannelsKey) is null)
-                        missingFields.Add(Data.Models.Metadata.Sound.ChannelsKey);
+                    if (sound.Channels is null)
+                        missingFields.Add(nameof(Data.Models.Metadata.Sound.Channels));
                     break;
 
                 case Input input:
diff --git a/SabreTools.Metadata.DatFiles/Formats/Listxml.cs b/SabreTools.Metadata.DatFiles/Formats/Listxml.cs
index fbdc657a..27e985fe 100644
--- a/SabreTools.Metadata.DatFiles/Formats/Listxml.cs
+++ b/SabreTools.Metadata.DatFiles/Formats/Listxml.cs
@@ -315,8 +315,8 @@ namespace SabreTools.Metadata.DatFiles.Formats
                     break;
 
                 case Sound sound:
-                    if (sound.ReadLong(Data.Models.Metadata.Sound.ChannelsKey) is null)
-                        missingFields.Add(Data.Models.Metadata.Sound.ChannelsKey);
+                    if (sound.Channels is null)
+                        missingFields.Add(nameof(Data.Models.Metadata.Sound.Channels));
                     break;
 
                 case Input input:
diff --git a/SabreTools.Metadata.DatItems/Formats/Sound.cs b/SabreTools.Metadata.DatItems/Formats/Sound.cs
index e726ff69..f5db3d17 100644
--- a/SabreTools.Metadata.DatItems/Formats/Sound.cs
+++ b/SabreTools.Metadata.DatItems/Formats/Sound.cs
@@ -12,6 +12,12 @@ namespace SabreTools.Metadata.DatItems.Formats
     {
         #region Fields
 
+        public long? Channels
+        {
+            get => (_internal as Data.Models.Metadata.Sound)?.Channels;
+            set => (_internal as Data.Models.Metadata.Sound)?.Channels = value;
+        }
+
         /// <inheritdoc>/>
         public override Data.Models.Metadata.ItemType ItemType
             => Data.Models.Metadata.ItemType.Sound;
@@ -22,13 +28,7 @@ namespace SabreTools.Metadata.DatItems.Formats
 
         public Sound() : base() { }
 
-        public Sound(Data.Models.Metadata.Sound item) : base(item)
-        {
-            // Process flag values
-            long? channels = ReadLong(Data.Models.Metadata.Sound.ChannelsKey);
-            if (channels is not null)
-                Write<string?>(Data.Models.Metadata.Sound.ChannelsKey, channels.ToString());
-        }
+        public Sound(Data.Models.Metadata.Sound item) : base(item) { }
 
         public Sound(Data.Models.Metadata.Sound item, Machine machine, Source source) : this(item)
         {
diff --git a/SabreTools.Metadata.Filter/FilterObject.cs b/SabreTools.Metadata.Filter/FilterObject.cs
index e3ab5156..aa13aa9a 100644
--- a/SabreTools.Metadata.Filter/FilterObject.cs
+++ b/SabreTools.Metadata.Filter/FilterObject.cs
@@ -739,6 +739,10 @@ namespace SabreTools.Metadata.Filter
                     checkValue = item.Tag;
                     return true;
 
+                case Sound item when fieldName == "channels":
+                    checkValue = item.Channels?.ToString();
+                    return true;
+
                 case Video item when fieldName == "screen":
                     checkValue = item.Screen?.AsStringValue();
                     return true;
diff --git a/SabreTools.Serialization.CrossModel.Test/ClrMameProTests.cs b/SabreTools.Serialization.CrossModel.Test/ClrMameProTests.cs
index 8660b78e..14ff0570 100644
--- a/SabreTools.Serialization.CrossModel.Test/ClrMameProTests.cs
+++ b/SabreTools.Serialization.CrossModel.Test/ClrMameProTests.cs
@@ -175,7 +175,7 @@ namespace SabreTools.Serialization.CrossModel.Test
 
             var sound = new Data.Models.ClrMamePro.Sound
             {
-                Channels = "XXXXXX",
+                Channels = 12345L,
             };
 
             var input = new Data.Models.ClrMamePro.Input
@@ -466,7 +466,7 @@ namespace SabreTools.Serialization.CrossModel.Test
         private static void Validate(Data.Models.ClrMamePro.Sound? sound)
         {
             Assert.NotNull(sound);
-            Assert.Equal("XXXXXX", sound.Channels);
+            Assert.Equal(12345L, sound.Channels);
         }
 
         /// <summary>
diff --git a/SabreTools.Serialization.CrossModel.Test/ListxmlTests.cs b/SabreTools.Serialization.CrossModel.Test/ListxmlTests.cs
index 3783410d..f8d265c8 100644
--- a/SabreTools.Serialization.CrossModel.Test/ListxmlTests.cs
+++ b/SabreTools.Serialization.CrossModel.Test/ListxmlTests.cs
@@ -149,7 +149,7 @@ namespace SabreTools.Serialization.CrossModel.Test
 
             var sound = new Data.Models.Listxml.Sound
             {
-                Channels = "XXXXXX",
+                Channels = 12345L,
             };
 
             var control = new Data.Models.Listxml.Control
@@ -589,7 +589,7 @@ namespace SabreTools.Serialization.CrossModel.Test
         private static void Validate(Data.Models.Listxml.Sound? sound)
         {
             Assert.NotNull(sound);
-            Assert.Equal("XXXXXX", sound.Channels);
+            Assert.Equal(12345L, sound.Channels);
         }
 
         /// <summary>
diff --git a/SabreTools.Serialization.CrossModel.Test/M1Tests.cs b/SabreTools.Serialization.CrossModel.Test/M1Tests.cs
index 4bd22fb2..d3b3bbda 100644
--- a/SabreTools.Serialization.CrossModel.Test/M1Tests.cs
+++ b/SabreTools.Serialization.CrossModel.Test/M1Tests.cs
@@ -145,7 +145,7 @@ namespace SabreTools.Serialization.CrossModel.Test
 
             var sound = new Data.Models.Listxml.Sound
             {
-                Channels = "XXXXXX",
+                Channels = 12345L,
             };
 
             var control = new Data.Models.Listxml.Control
@@ -583,7 +583,7 @@ namespace SabreTools.Serialization.CrossModel.Test
         private static void Validate(Data.Models.Listxml.Sound? sound)
         {
             Assert.NotNull(sound);
-            Assert.Equal("XXXXXX", sound.Channels);
+            Assert.Equal(12345L, sound.Channels);
         }
 
         /// <summary>
diff --git a/SabreTools.Serialization.CrossModel.Test/MessTests.cs b/SabreTools.Serialization.CrossModel.Test/MessTests.cs
index e0f8517d..d8107b27 100644
--- a/SabreTools.Serialization.CrossModel.Test/MessTests.cs
+++ b/SabreTools.Serialization.CrossModel.Test/MessTests.cs
@@ -145,7 +145,7 @@ namespace SabreTools.Serialization.CrossModel.Test
 
             var sound = new Data.Models.Listxml.Sound
             {
-                Channels = "XXXXXX",
+                Channels = 12345L,
             };
 
             var control = new Data.Models.Listxml.Control
@@ -583,7 +583,7 @@ namespace SabreTools.Serialization.CrossModel.Test
         private static void Validate(Data.Models.Listxml.Sound? sound)
         {
             Assert.NotNull(sound);
-            Assert.Equal("XXXXXX", sound.Channels);
+            Assert.Equal(12345L, sound.Channels);
         }
 
         /// <summary>
diff --git a/SabreTools.Serialization.CrossModel/ClrMamePro.Deserializer.cs b/SabreTools.Serialization.CrossModel/ClrMamePro.Deserializer.cs
index 24a7ed8f..abc250fb 100644
--- a/SabreTools.Serialization.CrossModel/ClrMamePro.Deserializer.cs
+++ b/SabreTools.Serialization.CrossModel/ClrMamePro.Deserializer.cs
@@ -328,7 +328,7 @@ namespace SabreTools.Serialization.CrossModel
         {
             var sound = new Sound
             {
-                Channels = item.ReadString(Data.Models.Metadata.Sound.ChannelsKey),
+                Channels = item.Channels,
             };
             return sound;
         }
diff --git a/SabreTools.Serialization.CrossModel/ClrMamePro.Serializer.cs b/SabreTools.Serialization.CrossModel/ClrMamePro.Serializer.cs
index 3e3a1b30..99b281ce 100644
--- a/SabreTools.Serialization.CrossModel/ClrMamePro.Serializer.cs
+++ b/SabreTools.Serialization.CrossModel/ClrMamePro.Serializer.cs
@@ -341,7 +341,7 @@ namespace SabreTools.Serialization.CrossModel
         {
             var sound = new Data.Models.Metadata.Sound
             {
-                [Data.Models.Metadata.Sound.ChannelsKey] = item.Channels,
+                Channels = item.Channels,
             };
             return sound;
         }
diff --git a/SabreTools.Serialization.CrossModel/Listxml.Deserializer.cs b/SabreTools.Serialization.CrossModel/Listxml.Deserializer.cs
index e36a8a08..15058bcd 100644
--- a/SabreTools.Serialization.CrossModel/Listxml.Deserializer.cs
+++ b/SabreTools.Serialization.CrossModel/Listxml.Deserializer.cs
@@ -646,7 +646,7 @@ namespace SabreTools.Serialization.CrossModel
         {
             var sound = new Sound
             {
-                Channels = item.ReadString(Data.Models.Metadata.Sound.ChannelsKey),
+                Channels = item.Channels,
             };
             return sound;
         }
diff --git a/SabreTools.Serialization.CrossModel/Listxml.Serializer.cs b/SabreTools.Serialization.CrossModel/Listxml.Serializer.cs
index 6cd096b6..c4687ff2 100644
--- a/SabreTools.Serialization.CrossModel/Listxml.Serializer.cs
+++ b/SabreTools.Serialization.CrossModel/Listxml.Serializer.cs
@@ -687,7 +687,7 @@ namespace SabreTools.Serialization.CrossModel
         {
             var sound = new Data.Models.Metadata.Sound
             {
-                [Data.Models.Metadata.Sound.ChannelsKey] = item.Channels,
+                Channels = item.Channels,
             };
             return sound;
         }
diff --git a/SabreTools.Serialization.Readers.Test/ClrMameProTests.cs b/SabreTools.Serialization.Readers.Test/ClrMameProTests.cs
index 731bfba5..afe24853 100644
--- a/SabreTools.Serialization.Readers.Test/ClrMameProTests.cs
+++ b/SabreTools.Serialization.Readers.Test/ClrMameProTests.cs
@@ -292,7 +292,7 @@ namespace SabreTools.Serialization.Readers.Test
 
             var sound = new Data.Models.ClrMamePro.Sound
             {
-                Channels = "XXXXXX",
+                Channels = 12345L,
             };
 
             var input = new Data.Models.ClrMamePro.Input
@@ -583,7 +583,7 @@ namespace SabreTools.Serialization.Readers.Test
         private static void Validate(Data.Models.ClrMamePro.Sound? sound)
         {
             Assert.NotNull(sound);
-            Assert.Equal("XXXXXX", sound.Channels);
+            Assert.Equal(12345L, sound.Channels);
         }
 
         /// <summary>
diff --git a/SabreTools.Serialization.Readers.Test/ListxmlTests.cs b/SabreTools.Serialization.Readers.Test/ListxmlTests.cs
index c317c05c..de443527 100644
--- a/SabreTools.Serialization.Readers.Test/ListxmlTests.cs
+++ b/SabreTools.Serialization.Readers.Test/ListxmlTests.cs
@@ -216,7 +216,7 @@ namespace SabreTools.Serialization.Readers.Test
 
             var sound = new Data.Models.Listxml.Sound
             {
-                Channels = "XXXXXX",
+                Channels = 12345L,
             };
 
             var control = new Data.Models.Listxml.Control
@@ -656,7 +656,7 @@ namespace SabreTools.Serialization.Readers.Test
         private static void Validate(Data.Models.Listxml.Sound? sound)
         {
             Assert.NotNull(sound);
-            Assert.Equal("XXXXXX", sound.Channels);
+            Assert.Equal(12345L, sound.Channels);
         }
 
         /// <summary>
diff --git a/SabreTools.Serialization.Readers.Test/M1Tests.cs b/SabreTools.Serialization.Readers.Test/M1Tests.cs
index 21c4a6eb..64c85fea 100644
--- a/SabreTools.Serialization.Readers.Test/M1Tests.cs
+++ b/SabreTools.Serialization.Readers.Test/M1Tests.cs
@@ -212,7 +212,7 @@ namespace SabreTools.Serialization.Readers.Test
 
             var sound = new Data.Models.Listxml.Sound
             {
-                Channels = "XXXXXX",
+                Channels = 12345L,
             };
 
             var control = new Data.Models.Listxml.Control
@@ -650,7 +650,7 @@ namespace SabreTools.Serialization.Readers.Test
         private static void Validate(Data.Models.Listxml.Sound? sound)
         {
             Assert.NotNull(sound);
-            Assert.Equal("XXXXXX", sound.Channels);
+            Assert.Equal(12345L, sound.Channels);
         }
 
         /// <summary>
diff --git a/SabreTools.Serialization.Readers.Test/MessTests.cs b/SabreTools.Serialization.Readers.Test/MessTests.cs
index 6e6d0895..5570a6b8 100644
--- a/SabreTools.Serialization.Readers.Test/MessTests.cs
+++ b/SabreTools.Serialization.Readers.Test/MessTests.cs
@@ -212,7 +212,7 @@ namespace SabreTools.Serialization.Readers.Test
 
             var sound = new Data.Models.Listxml.Sound
             {
-                Channels = "XXXXXX",
+                Channels = 12345L,
             };
 
             var control = new Data.Models.Listxml.Control
@@ -650,7 +650,7 @@ namespace SabreTools.Serialization.Readers.Test
         private static void Validate(Data.Models.Listxml.Sound? sound)
         {
             Assert.NotNull(sound);
-            Assert.Equal("XXXXXX", sound.Channels);
+            Assert.Equal(12345L, sound.Channels);
         }
 
         /// <summary>
diff --git a/SabreTools.Serialization.Readers/ClrMamePro.cs b/SabreTools.Serialization.Readers/ClrMamePro.cs
index 0ce08e58..2761c576 100644
--- a/SabreTools.Serialization.Readers/ClrMamePro.cs
+++ b/SabreTools.Serialization.Readers/ClrMamePro.cs
@@ -5,6 +5,7 @@ using System.Text;
 using SabreTools.Data.Extensions;
 using SabreTools.Data.Models.ClrMamePro;
 using SabreTools.Text.ClrMamePro;
+using SabreTools.Text.Extensions;
 
 #pragma warning disable CA1822 // Mark members as static
 namespace SabreTools.Serialization.Readers
@@ -847,7 +848,7 @@ namespace SabreTools.Serialization.Readers
                 switch (kvp.Key?.ToLowerInvariant())
                 {
                     case "channels":
-                        sound.Channels = kvp.Value;
+                        sound.Channels = NumberHelper.ConvertToInt64(kvp.Value);
                         break;
                     default:
                         // TODO: Log invalid values
diff --git a/SabreTools.Serialization.Readers/Listxml.cs b/SabreTools.Serialization.Readers/Listxml.cs
index 9e38ba06..aaa70299 100644
--- a/SabreTools.Serialization.Readers/Listxml.cs
+++ b/SabreTools.Serialization.Readers/Listxml.cs
@@ -4,6 +4,7 @@ using System.IO;
 using System.Xml;
 using SabreTools.Data.Extensions;
 using SabreTools.Data.Models.Listxml;
+using SabreTools.Text.Extensions;
 
 namespace SabreTools.Serialization.Readers
 {
@@ -1160,7 +1161,7 @@ namespace SabreTools.Serialization.Readers
         {
             var obj = new Sound();
 
-            obj.Channels = reader.GetAttribute("channels");
+            obj.Channels = NumberHelper.ConvertToInt64(reader.GetAttribute("channels"));
 
             return obj;
         }
diff --git a/SabreTools.Serialization.Readers/M1.cs b/SabreTools.Serialization.Readers/M1.cs
index 154c9aab..5a2b94df 100644
--- a/SabreTools.Serialization.Readers/M1.cs
+++ b/SabreTools.Serialization.Readers/M1.cs
@@ -4,6 +4,7 @@ using System.IO;
 using System.Xml;
 using SabreTools.Data.Extensions;
 using SabreTools.Data.Models.Listxml;
+using SabreTools.Text.Extensions;
 
 namespace SabreTools.Serialization.Readers
 {
@@ -1158,7 +1159,7 @@ namespace SabreTools.Serialization.Readers
         {
             var obj = new Sound();
 
-            obj.Channels = reader.GetAttribute("channels");
+            obj.Channels = NumberHelper.ConvertToInt64(reader.GetAttribute("channels"));
 
             return obj;
         }
diff --git a/SabreTools.Serialization.Readers/Mess.cs b/SabreTools.Serialization.Readers/Mess.cs
index a39567c4..534a9717 100644
--- a/SabreTools.Serialization.Readers/Mess.cs
+++ b/SabreTools.Serialization.Readers/Mess.cs
@@ -4,6 +4,7 @@ using System.IO;
 using System.Xml;
 using SabreTools.Data.Extensions;
 using SabreTools.Data.Models.Listxml;
+using SabreTools.Text.Extensions;
 
 namespace SabreTools.Serialization.Readers
 {
@@ -1158,7 +1159,7 @@ namespace SabreTools.Serialization.Readers
         {
             var obj = new Sound();
 
-            obj.Channels = reader.GetAttribute("channels");
+            obj.Channels = NumberHelper.ConvertToInt64(reader.GetAttribute("channels"));
 
             return obj;
         }
diff --git a/SabreTools.Serialization.Writers/ClrMamePro.cs b/SabreTools.Serialization.Writers/ClrMamePro.cs
index f56bddbc..cd4f9df1 100644
--- a/SabreTools.Serialization.Writers/ClrMamePro.cs
+++ b/SabreTools.Serialization.Writers/ClrMamePro.cs
@@ -435,7 +435,7 @@ namespace SabreTools.Serialization.Writers
                 return;
 
             writer.WriteStartElement("sound");
-            writer.WriteRequiredAttributeString("channels", sound.Channels, throwOnError: true);
+            writer.WriteRequiredAttributeString("channels", sound.Channels?.ToString(), throwOnError: true);
             writer.WriteEndElement(); // sound
         }
 
diff --git a/SabreTools.Serialization.Writers/Listxml.cs b/SabreTools.Serialization.Writers/Listxml.cs
index cc458cf6..edb20f88 100644
--- a/SabreTools.Serialization.Writers/Listxml.cs
+++ b/SabreTools.Serialization.Writers/Listxml.cs
@@ -823,7 +823,7 @@ namespace SabreTools.Serialization.Writers
         {
             writer.WriteStartElement("sound");
 
-            writer.WriteRequiredAttributeString("channels", obj.Channels);
+            writer.WriteRequiredAttributeString("channels", obj.Channels?.ToString());
 
             writer.WriteEndElement();
         }
diff --git a/SabreTools.Serialization.Writers/M1.cs b/SabreTools.Serialization.Writers/M1.cs
index 7f4137e6..59599972 100644
--- a/SabreTools.Serialization.Writers/M1.cs
+++ b/SabreTools.Serialization.Writers/M1.cs
@@ -821,7 +821,7 @@ namespace SabreTools.Serialization.Writers
         {
             writer.WriteStartElement("sound");
 
-            writer.WriteRequiredAttributeString("channels", obj.Channels);
+            writer.WriteRequiredAttributeString("channels", obj.Channels?.ToString());
 
             writer.WriteEndElement();
         }
diff --git a/SabreTools.Serialization.Writers/Mess.cs b/SabreTools.Serialization.Writers/Mess.cs
index c74c693a..c705d657 100644
--- a/SabreTools.Serialization.Writers/Mess.cs
+++ b/SabreTools.Serialization.Writers/Mess.cs
@@ -821,7 +821,7 @@ namespace SabreTools.Serialization.Writers
         {
             writer.WriteStartElement("sound");
 
-            writer.WriteRequiredAttributeString("channels", obj.Channels);
+            writer.WriteRequiredAttributeString("channels", obj.Channels?.ToString());
 
             writer.WriteEndElement();
         }