added probability to voicetagdefs, to make voice clips play at random intervals

1.5/Source/Animations/AnimationWorkers/AnimationWorker_KeyframesExtended.cs

@@ -35,7 +35,17 @@ namespace Rimworld_Animations
             {
                 if (tick == keyframe.tick)
                 {
-                    return (keyframe as ExtendedKeyframe).voice;
+                    VoiceTagDef voiceTag = (keyframe as ExtendedKeyframe).voice;
+
+                    //probability checking 
+                    if (Rand.Chance(voiceTag.probability))
+                    {
+                        return voiceTag;
+                    }
+                    else
+                    {
+                        return null;
+                    }
                 }
 
             }

1.5/Source/Voices/VoiceTagDef.cs

@@ -9,5 +9,8 @@ namespace Rimworld_Animations
 {
     public class VoiceTagDef : Def
     {
+
+        public float probability = 1;
+
     }
 }