A lot of stuff to Commit because I forgot to Commit in between (Don't do stuff like this, kids)

Assets/Scripts/TrackStuff/MyButtonTrackMixer.cs

@@ -6,8 +6,10 @@ public class MyButtonTrackMixer : PlayableBehaviour
     public override void ProcessFrame(Playable playable, FrameData info, object playerData)
     {
         var myButton = playerData as MyButton;
+        
+        if(!myButton){return;}
 
-        myButton!.isActive = false;
+        myButton.isActive = false;
 
         for (var i = 0; i < playable.GetInputCount(); i++)
         {

Assets/Scripts/TrackStuff/SubtitleTrack.cs

@@ -0,0 +1,14 @@
+using TMPro;
+using UnityEngine;
+using UnityEngine.Playables;
+using UnityEngine.Timeline;
+
+[TrackBindingType(typeof(TextMeshProUGUI))]
+[TrackClipType(typeof(SubtitleTrackClip))]
+public class SubtitleTrack : TrackAsset
+{
+    public override Playable CreateTrackMixer(PlayableGraph graph, GameObject go, int inputCount)
+    {
+        return ScriptPlayable<SubtitleTrackMixer>.Create(graph, inputCount);
+    }
+}

Assets/Scripts/TrackStuff/SubtitleTrack.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: cf966904c89cec546b53a94cd9de7805

Assets/Scripts/TrackStuff/SubtitleTrackBehaviour.cs

@@ -0,0 +1,7 @@
+using UnityEngine;
+using UnityEngine.Playables;
+
+public class SubtitleTrackBehaviour : PlayableBehaviour
+{
+    public string subtitleText;
+}

Assets/Scripts/TrackStuff/SubtitleTrackBehaviour.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 1b3d76d457153a040aacb9ede466c956

Assets/Scripts/TrackStuff/SubtitleTrackClip.cs

@@ -0,0 +1,17 @@
+using UnityEngine;
+using UnityEngine.Playables;
+
+public class SubtitleTrackClip : PlayableAsset
+{
+    public string subtitleText;
+    
+    public override Playable CreatePlayable(PlayableGraph graph, GameObject owner)
+    {
+        var playable = ScriptPlayable<SubtitleTrackBehaviour>.Create(graph);
+        
+        var subtitleTrackBehaviour = playable.GetBehaviour();
+        subtitleTrackBehaviour.subtitleText = subtitleText;
+        
+        return playable;
+    }
+}

Assets/Scripts/TrackStuff/SubtitleTrackClip.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 1d30b6f2f1cc7954e9c7fed4e91c53a2

Assets/Scripts/TrackStuff/SubtitleTrackMixer.cs

@@ -0,0 +1,31 @@
+using TMPro;
+using UnityEngine;
+using UnityEngine.Playables;
+
+public class SubtitleTrackMixer : PlayableBehaviour
+{
+    public override void ProcessFrame(Playable playable, FrameData info, object playerData)
+    {
+        var text = playerData as TextMeshProUGUI;
+
+        var currentText = "";
+
+        if (!text) { return; }
+        
+        for (var i = 0; i < playable.GetInputCount(); i++)
+        {
+            if (playable.GetInputWeight(i) <=0)
+                continue;
+            
+            var inputPlayable = (ScriptPlayable<SubtitleTrackBehaviour>)playable.GetInput(i);
+            var input = inputPlayable.GetBehaviour();
+            
+            if (input.subtitleText != "")
+            {
+                currentText = input.subtitleText;
+            }
+        }
+        
+        text.text = currentText;
+    }
+}

Assets/Scripts/TrackStuff/SubtitleTrackMixer.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: ce87fa1edd37b85438c2c455cbaf4f70