diff --git a/ME3Tweaks.Wwiser.Tests/ActionTests/PlayTests.cs b/ME3Tweaks.Wwiser.Tests/ActionTests/PlayTests.cs
new file mode 100644
index 0000000..b8ea1bd
--- /dev/null
+++ b/ME3Tweaks.Wwiser.Tests/ActionTests/PlayTests.cs
@@ -0,0 +1,36 @@
+using ME3Tweaks.Wwiser.Model.Action;
+using ME3Tweaks.Wwiser.Model.RTPC;
+using Action = ME3Tweaks.Wwiser.Model.Hierarchy.Action;
+
+namespace ME3Tweaks.Wwiser.Tests.ActionTests;
+
+public class PlayTests
+{
+    [Test]
+    public void Play_V134_Parses()
+    {
+        var data = TestData.GetTestDataBytes(@"Action",@"Play_v134.bin");
+        var (_, result) = TestHelpers.Deserialize<Action>(data, 134);
+        
+        Assert.Multiple(() =>
+        {
+            Assert.That(result.Type.Value, Is.EqualTo(ActionTypeValue.Play));
+            Assert.That(result.IsBus, Is.EqualTo(false));
+            Assert.That(result.ActionParams, Is.InstanceOf<Play>());
+
+            var play = result.ActionParams as Play;
+            Assert.That(play!.Params.CurveInterpolation, Is.EqualTo(CurveInterpolation.Linear));
+        });
+    }
+    
+    [TestCase("Play_V134.bin", 134)]
+    [TestCase("Play_V56.bin", 56)]
+    public void Play_Reserializes(string file, int version)
+    {
+        var data = TestData.GetTestDataBytes(@"Action",file);
+        var (_, result) = TestHelpers.Deserialize<Action>(data, version);
+        
+        var reserialized = TestHelpers.Serialize(result, version);
+        Assert.That(reserialized, Is.EqualTo(data));
+    }
+}
\ No newline at end of file
diff --git a/ME3Tweaks.Wwiser.Tests/TestData/Action/Play_V134.bin b/ME3Tweaks.Wwiser.Tests/TestData/Action/Play_V134.bin
new file mode 100644
index 0000000..8310e77
Binary files /dev/null and b/ME3Tweaks.Wwiser.Tests/TestData/Action/Play_V134.bin differ
diff --git a/ME3Tweaks.Wwiser.Tests/TestData/Action/Play_V56.bin b/ME3Tweaks.Wwiser.Tests/TestData/Action/Play_V56.bin
new file mode 100644
index 0000000..34c7ccf
Binary files /dev/null and b/ME3Tweaks.Wwiser.Tests/TestData/Action/Play_V56.bin differ
diff --git a/ME3Tweaks.Wwiser/Model/Action/ActionParamsFactory.cs b/ME3Tweaks.Wwiser/Model/Action/ActionParamsFactory.cs
index bec2d5b..868bcb5 100644
--- a/ME3Tweaks.Wwiser/Model/Action/ActionParamsFactory.cs
+++ b/ME3Tweaks.Wwiser/Model/Action/ActionParamsFactory.cs
@@ -6,28 +6,18 @@ namespace ME3Tweaks.Wwiser.Model.Action;
 
 public class ActionParamsFactory : ISubtypeFactory
 {
-    private static readonly Dictionary<Type, ActionTypeValue> TypeToEnum = new()
-    {
-        { typeof(Play), ActionTypeValue.Play},
-    };
-    
     public bool TryGetKey(Type valueType, [UnscopedRef] out object key)
     {
-        if (TypeToEnum.TryGetValue(valueType, out var value))
-        {
-            key = value;
-            return true;
-        }
-
-        // fallback
-        key = ActionTypeValue.Play;
-        return false;
+        throw new NotImplementedException();
     }
 
     public bool TryGetType(object key, [UnscopedRef] out Type type)
     {
         type = (ActionTypeValue)key switch
         {
+            ActionTypeValue.Stop => typeof(Active),
+            ActionTypeValue.Pause => typeof(Active),
+            ActionTypeValue.Resume => typeof(Active),
             ActionTypeValue.Play => typeof(Play),
             _ => typeof(Play)
         };
diff --git a/ME3Tweaks.Wwiser/Model/Action/ActionSpecificParamsFactory.cs b/ME3Tweaks.Wwiser/Model/Action/ActionSpecificParamsFactory.cs
new file mode 100644
index 0000000..2ac59a8
--- /dev/null
+++ b/ME3Tweaks.Wwiser/Model/Action/ActionSpecificParamsFactory.cs
@@ -0,0 +1,23 @@
+using System.Diagnostics.CodeAnalysis;
+using BinarySerialization;
+using ME3Tweaks.Wwiser.Model.Hierarchy;
+
+namespace ME3Tweaks.Wwiser.Model.Action;
+
+public class ActionSpecificParamsFactory : ISubtypeFactory
+{
+    public bool TryGetKey(Type valueType, [UnscopedRef] out object key)
+    {
+        throw new NotImplementedException();
+    }
+
+    public bool TryGetType(object key, [UnscopedRef] out Type type)
+    {
+        type = (ActionTypeValue)key switch
+        {
+            ActionTypeValue.Play => typeof(Specific.Action),
+            _ => typeof(Play)
+        };
+        return true;
+    }
+}
diff --git a/ME3Tweaks.Wwiser/Model/Action/Active.cs b/ME3Tweaks.Wwiser/Model/Action/Active.cs
new file mode 100644
index 0000000..5f1e4ab
--- /dev/null
+++ b/ME3Tweaks.Wwiser/Model/Action/Active.cs
@@ -0,0 +1,14 @@
+using BinarySerialization;
+using ME3Tweaks.Wwiser.Attributes;
+
+namespace ME3Tweaks.Wwiser.Model.Action;
+
+public class Active : IActionParams
+{
+    [FieldOrder(1)]
+    [SerializeWhenVersion(56, ComparisonOperator.LessThanOrEqual)]
+    public uint SubSectionSize { get; set; }
+
+    [FieldOrder(2)] 
+    public required ActiveParams Params { get; set; }
+}
\ No newline at end of file
diff --git a/ME3Tweaks.Wwiser/Model/Action/ActiveParams.cs b/ME3Tweaks.Wwiser/Model/Action/ActiveParams.cs
new file mode 100644
index 0000000..037565e
--- /dev/null
+++ b/ME3Tweaks.Wwiser/Model/Action/ActiveParams.cs
@@ -0,0 +1,36 @@
+using BinarySerialization;
+using ME3Tweaks.Wwiser.Attributes;
+using ME3Tweaks.Wwiser.Model.Action.Specific;
+using ME3Tweaks.Wwiser.Model.RTPC;
+
+namespace ME3Tweaks.Wwiser.Model.Action;
+
+public class ActiveParams
+{
+    [FieldOrder(0)]
+    [SerializeWhenVersion(56, ComparisonOperator.LessThanOrEqual)]
+    public int Time { get; set; }
+
+    [FieldOrder(1)]
+    [SerializeWhenVersion(56, ComparisonOperator.LessThanOrEqual)]
+    public int TimeMin { get; set; }
+
+    [FieldOrder(2)]
+    [SerializeWhenVersion(56, ComparisonOperator.LessThanOrEqual)]
+    public int TimeMax { get; set; }
+
+    [FieldOrder(3)]
+    [SerializeAs(SerializedType.UInt1)]
+    public CurveInterpolation CurveInterpolation { get; set; }
+
+    [FieldOrder(4)]
+    [SerializeWhenVersion(56, ComparisonOperator.LessThanOrEqual)]
+    [SubtypeFactory($"{nameof(Hierarchy.Action.Type)}.{nameof(Hierarchy.Action.Type.Value)}", 
+        typeof(ActionSpecificParamsFactory), BindingMode = BindingMode.OneWay,
+        AncestorType = typeof(Hierarchy.Action), RelativeSourceMode = RelativeSourceMode.FindAncestor)]
+    public required ISpecificParams SpecificParams { get; set; }
+
+    [FieldOrder(5)]
+    [SerializeWhenVersion(56, ComparisonOperator.LessThanOrEqual)]
+    public ExceptParams ExceptParams { get; set; } = new();
+}
\ No newline at end of file
diff --git a/ME3Tweaks.Wwiser/Model/Action/ExceptParams.cs b/ME3Tweaks.Wwiser/Model/Action/ExceptParams.cs
index b3de894..34df0eb 100644
--- a/ME3Tweaks.Wwiser/Model/Action/ExceptParams.cs
+++ b/ME3Tweaks.Wwiser/Model/Action/ExceptParams.cs
@@ -6,8 +6,8 @@ namespace ME3Tweaks.Wwiser.Model.Action;
 
 public class ExceptParams
 {
-    [FieldOrder(0)]
-    public VarCount ExceptionCount { get; set; }
+    [FieldOrder(0)] 
+    public VarCount ExceptionCount { get; set; } = new();
 
     [FieldOrder(1)]
     [FieldCount($"{nameof(ExceptionCount)}.{nameof(ExceptionCount.Value)}")]
diff --git a/ME3Tweaks.Wwiser/Model/Action/ActionParams.cs b/ME3Tweaks.Wwiser/Model/Action/IActionParams.cs
similarity index 56%
rename from ME3Tweaks.Wwiser/Model/Action/ActionParams.cs
rename to ME3Tweaks.Wwiser/Model/Action/IActionParams.cs
index 85a0387..104905a 100644
--- a/ME3Tweaks.Wwiser/Model/Action/ActionParams.cs
+++ b/ME3Tweaks.Wwiser/Model/Action/IActionParams.cs
@@ -1,6 +1,3 @@
 namespace ME3Tweaks.Wwiser.Model.Action;
 
-public class ActionParams
-{
-    
-}
\ No newline at end of file
+public interface IActionParams;
\ No newline at end of file
diff --git a/ME3Tweaks.Wwiser/Model/Action/Play.cs b/ME3Tweaks.Wwiser/Model/Action/Play.cs
index e58512f..70770d4 100644
--- a/ME3Tweaks.Wwiser/Model/Action/Play.cs
+++ b/ME3Tweaks.Wwiser/Model/Action/Play.cs
@@ -1,40 +1,17 @@
 using BinarySerialization;
 using ME3Tweaks.Wwiser.Attributes;
+using ME3Tweaks.Wwiser.Model.Action.Specific;
 using ME3Tweaks.Wwiser.Model.RTPC;
 
 namespace ME3Tweaks.Wwiser.Model.Action;
 
-public class Play : ActionParams
+public class Play : Active
 {
-    [FieldOrder(0)]
-    [SerializeWhenVersion(56, ComparisonOperator.LessThanOrEqual)]
-    public int Time { get; set; }
-    
     [FieldOrder(1)]
-    [SerializeWhenVersion(56, ComparisonOperator.LessThanOrEqual)]
-    public int TimeMin { get; set; }
-    
-    [FieldOrder(2)]
-    [SerializeWhenVersion(56, ComparisonOperator.LessThanOrEqual)]
-    public int TimeMax { get; set; }
-    
-    [FieldOrder(3)]
-    [SerializeAs(SerializedType.UInt1)]
-    public CurveInterpolation CurveInterpolation { get; set; }
-    
-    [FieldOrder(4)]
-    [SerializeWhenVersion(56, ComparisonOperator.LessThanOrEqual)]
-    public SpecificParams SpecificParams { get; set; }
-    
-    [FieldOrder(5)]
-    [SerializeWhenVersion(56, ComparisonOperator.LessThanOrEqual)]
-    public ExceptParams ExceptParams { get; set; }
-    
-    [FieldOrder(6)]
     [SerializeWhenVersion(26, ComparisonOperator.GreaterThan)]
     public uint BankId { get; set; }
     
-    [FieldOrder(7)]
+    [FieldOrder(2)]
     [SerializeWhenVersion(144, ComparisonOperator.GreaterThanOrEqual)]
     public uint BankType { get; set; }
 }
\ No newline at end of file
diff --git a/ME3Tweaks.Wwiser/Model/Action/SpecificParams.cs b/ME3Tweaks.Wwiser/Model/Action/Specific/Action.cs
similarity index 71%
rename from ME3Tweaks.Wwiser/Model/Action/SpecificParams.cs
rename to ME3Tweaks.Wwiser/Model/Action/Specific/Action.cs
index 6c21b16..436afcc 100644
--- a/ME3Tweaks.Wwiser/Model/Action/SpecificParams.cs
+++ b/ME3Tweaks.Wwiser/Model/Action/Specific/Action.cs
@@ -1,9 +1,9 @@
 using BinarySerialization;
 using ME3Tweaks.Wwiser.Attributes;
 
-namespace ME3Tweaks.Wwiser.Model.Action;
+namespace ME3Tweaks.Wwiser.Model.Action.Specific;
 
-public class SpecificParams
+public class Action : ISpecificParams
 {
     [FieldOrder(0)]
     [FieldLength(0x10)]
diff --git a/ME3Tweaks.Wwiser/Model/Action/Specific/ISpecificParams.cs b/ME3Tweaks.Wwiser/Model/Action/Specific/ISpecificParams.cs
new file mode 100644
index 0000000..e8a673c
--- /dev/null
+++ b/ME3Tweaks.Wwiser/Model/Action/Specific/ISpecificParams.cs
@@ -0,0 +1,3 @@
+namespace ME3Tweaks.Wwiser.Model.Action.Specific;
+
+public interface ISpecificParams;
\ No newline at end of file
diff --git a/ME3Tweaks.Wwiser/Model/Hierarchy/Action.cs b/ME3Tweaks.Wwiser/Model/Hierarchy/Action.cs
index c98c4df..7089cc4 100644
--- a/ME3Tweaks.Wwiser/Model/Hierarchy/Action.cs
+++ b/ME3Tweaks.Wwiser/Model/Hierarchy/Action.cs
@@ -26,20 +26,16 @@ public class Action : HircItem
     public int DelayMax { get; set; }
     
     [FieldOrder(5)]
-    [SerializeWhenVersion(56, ComparisonOperator.LessThanOrEqual)]
-    public uint SubSectionSize { get; set; } // TODO: this needs to go away
-    
-    [FieldOrder(6)]
     [SerializeWhenVersion(65, ComparisonOperator.GreaterThan)]
     [SerializeAs(SerializedType.UInt1)]
     public bool IsBus { get; set; }
 
-    [FieldOrder(7)]
+    [FieldOrder(6)]
     [SerializeWhenVersion(56, ComparisonOperator.GreaterThan)]
     public InitialParamsV62 PropBundle { get; set; } = new();
 
-    [FieldOrder(8)]
-    [FieldLength(nameof(SubSectionSize))]
-    [SubtypeFactory($"{nameof(Type)}.{nameof(Type.Value)}", typeof(ActionParamsFactory))]
-    public ActionParams ActionParams { get; set; } = new();
+    [FieldOrder(7)]
+    [SubtypeFactory($"{nameof(Type)}.{nameof(Type.Value)}", typeof(ActionParamsFactory),
+        BindingMode = BindingMode.OneWay)]
+    public required IActionParams ActionParams { get; set; }
 }
\ No newline at end of file