diff --git a/src/nvda_voicemeeter/builder.py b/src/nvda_voicemeeter/builder.py
index 0727db1..959c41d 100644
--- a/src/nvda_voicemeeter/builder.py
+++ b/src/nvda_voicemeeter/builder.py
@@ -296,7 +296,7 @@ class Builder:
                     for j in range(self.kind.phys_out + self.kind.virt_out)
                 ]
             )
-            if i == self.kind.phys_in + self.kind.virt_in - 2:
+            if i == self.kind.phys_in + 1:
                 layout.append(
                     [
                         psg.Button("K", size=(6, 2), key=f"STRIP {i}||MONO"),
diff --git a/src/nvda_voicemeeter/window.py b/src/nvda_voicemeeter/window.py
index bdd29c4..8a41127 100644
--- a/src/nvda_voicemeeter/window.py
+++ b/src/nvda_voicemeeter/window.py
@@ -506,7 +506,7 @@ class NVDAVMWindow(psg.Window):
                         case "MONO":
                             if int(index) < self.kind.phys_in:
                                 actual = param.lower()
-                            elif int(index) == self.kind.phys_in + self.kind.virt_in - 2:
+                            elif int(index) == self.kind.phys_in + 1:
                                 actual = "k"
                             else:
                                 actual = "mc"
@@ -536,7 +536,7 @@ class NVDAVMWindow(psg.Window):
                         case "MONO":
                             if int(index) < self.kind.phys_in:
                                 actual = param.lower()
-                            elif int(index) == self.kind.phys_in + self.kind.virt_in - 2:
+                            elif int(index) == self.kind.phys_in + 1:
                                 actual = "k"
                             else:
                                 actual = "mc"