diff --git a/src/nvda_voicemeeter/util.py b/src/nvda_voicemeeter/util.py
new file mode 100644
index 0000000..11249e5
--- /dev/null
+++ b/src/nvda_voicemeeter/util.py
@@ -0,0 +1,13 @@
+def get_asio_checkbox_index(channel, num):
+    if channel == 0:
+        return 2 * num - 2
+    return 2 * num - 1
+
+
+def get_insert_checkbox_index(kind, channel, num):
+    if num <= kind.phys_in:
+        if channel == 0:
+            return 2 * num - 2
+        else:
+            return 2 * num - 1
+    return (2 * kind.phys_in) + (8 * (num - kind.phys_in - 1)) + channel