diff --git a/Apollo/Devices/Flip.cs b/Apollo/Devices/Flip.cs
index b7558ddb..80c2c05c 100644
--- a/Apollo/Devices/Flip.cs
+++ b/Apollo/Devices/Flip.cs
@@ -42,7 +42,10 @@ public Flip(FlipType mode = FlipType.Horizontal, bool bypass = false): base("fli
         }
 
         public override void MIDIProcess(List<Signal> n)
-            => InvokeExit((Bypass? n.Select(i => i.Clone()) : Enumerable.Empty<Signal>()).Concat(n.Select(i => {
+            => InvokeExit((Bypass? n.Select(i => i.Clone()) : Enumerable.Empty<Signal>()).Concat(n.SelectMany(i => {
+                if (i.Index == 100) 
+                    return Bypass? Enumerable.Empty<Signal>() : new [] {i};
+                    
                 int x = i.Index % 10;
                 int y = i.Index / 10;
 
@@ -64,7 +67,7 @@ public override void MIDIProcess(List<Signal> n)
                 }
 
                 i.Index = (byte)(y * 10 + x);
-                return i;
+                return new [] {i};
             })).ToList());
         
         public class ModeUndoEntry: EnumSimplePathUndoEntry<Flip, FlipType> {
diff --git a/Apollo/Devices/Rotate.cs b/Apollo/Devices/Rotate.cs
index 3cad33f0..ccecf267 100644
--- a/Apollo/Devices/Rotate.cs
+++ b/Apollo/Devices/Rotate.cs
@@ -42,7 +42,10 @@ public Rotate(RotateType mode = RotateType.D90, bool bypass = false): base("rota
         }
 
         public override void MIDIProcess(List<Signal> n)
-            => InvokeExit((Bypass? n.Select(i => i.Clone()) : Enumerable.Empty<Signal>()).Concat(n.Select(i => {
+            => InvokeExit((Bypass? n.Select(i => i.Clone()) : Enumerable.Empty<Signal>()).Concat(n.SelectMany(i => {
+                if (i.Index == 100) 
+                    return Bypass? Enumerable.Empty<Signal>() : new [] {i};
+
                 if (Mode == RotateType.D90)
                     i.Index = (byte)((9 - i.Index % 10) * 10 + i.Index / 10);
 
@@ -52,7 +55,7 @@ public override void MIDIProcess(List<Signal> n)
                 else if (Mode == RotateType.D270)
                     i.Index = (byte)((i.Index % 10) * 10 + 9 - i.Index / 10);
 
-                return i;
+                return new [] {i};
             })).ToList());
         
         public class ModeUndoEntry: EnumSimplePathUndoEntry<Rotate, RotateType> {