diff --git a/csdr/chain/__init__.py b/csdr/chain/__init__.py
index 02bb5951..bebe121d 100644
--- a/csdr/chain/__init__.py
+++ b/csdr/chain/__init__.py
@@ -94,7 +94,7 @@ class Chain(Module):
         if self.writer is not None:
             newWorker.setWriter(self.writer)
 
-    def insert(self, newWorker, index=0):
+    def insert(self, index, newWorker):
         nextWorker = None
         previousWorker = None
         if index < len(self.workers):
diff --git a/csdr/chain/clientaudio.py b/csdr/chain/clientaudio.py
index febfd15c..9fd748b8 100644
--- a/csdr/chain/clientaudio.py
+++ b/csdr/chain/clientaudio.py
@@ -42,7 +42,7 @@ class ClientAudioChain(Chain):
             if index >= 0:
                 self.replace(index, converter)
             else:
-                self.insert(converter)
+                self.insert(0, converter)
 
     def setFormat(self, format: Format) -> None:
         if format == self.format:
diff --git a/csdr/chain/selector.py b/csdr/chain/selector.py
index 2f272bbc..8009f6b9 100644
--- a/csdr/chain/selector.py
+++ b/csdr/chain/selector.py
@@ -118,7 +118,7 @@ class Selector(Chain):
     def _enableBandpass(self):
         index = self.indexOf(lambda x: isinstance(x, Bandpass))
         if index < 0:
-            self.insert(self.bandpass, 2)
+            self.insert(2, self.bandpass)
 
     def _disableBandpass(self):
         index = self.indexOf(lambda x: isinstance(x, Bandpass))