diff --git a/karaoke-split.lua b/karaoke-split.lua
index 8bf8dd6..e60f3ef 100644
--- a/karaoke-split.lua
+++ b/karaoke-split.lua
@@ -1,38 +1,47 @@
-local tr = aegisub.gettext
-
-script_name = tr"Karaoke split line"
-script_description = tr"split line at marker according to ktags"
-script_author = "amoethyst"
-script_version = "1.0"
-
-function split_line(subs, sel)
-
-    function getduration(line)
-        d = 0
-
-        kduration = "{[^}]-\\[kK][fo]?(%d+)[^}]-}"
-        for match in line:gmatch(kduration) do
-            d = d + tonumber(match)
-        end
-
-        return d * 10
-    end
-
-    for _, i in ipairs(sel) do
-        line1 = subs[i]
-        line2 = subs[i]
-
-        line1.text, line2.text = line1.text:match("(.-){split}(.*)")
-
-        if line1.text ~= nil then
-            line1.end_time = line1.start_time + getduration(line1.text)
-            line2.start_time = line1.end_time
-        end
-
-        subs[i] = line1
-        subs.insert(i+1, line2)
-    end
-    aegisub.set_undo_point(tr"Karaoke split")
-end
-
-aegisub.register_macro(script_name, script_description, split_line)
+local tr = aegisub.gettext
+
+script_name = tr"Karaoke split line"
+script_description = tr"split line at marker according to ktags"
+script_author = "amoethyst"
+script_version = "1.0"
+
+function split_line(subs, sel)
+
+    function getduration(line)
+        d = 0
+
+        kduration = "{[^}]-\\[kK][fo]?(%d+)[^}]-}"
+        for match in line:gmatch(kduration) do
+            d = d + tonumber(match)
+        end
+
+        return d * 10
+    end
+
+    insertions = 0
+    for _, i in ipairs(sel) do
+        i = i + insertions
+        line1 = subs[i]
+        line2 = subs[i]
+
+        line1.text, line2.text = line1.text:match("(.-){split}(.*)")
+
+        while line1.text ~= nil do
+            line1.end_time = line1.start_time + getduration(line1.text)
+            line2.start_time = line1.end_time
+
+            subs[i] = line1
+            i = i + 1
+            insertions = insertions + 1
+            subs.insert(i, line2)
+            line1 = subs[i]
+
+            line1.text, line2.text = line1.text:match("(.-){split}(.*)")
+        end
+
+    end
+
+    aegisub.set_undo_point(tr"Karaoke split")
+end
+
+aegisub.register_macro(script_name, script_description, split_line)