diff --git a/csdr/chain/__init__.py b/csdr/chain/__init__.py
index bab0c0b..53afda0 100644
--- a/csdr/chain/__init__.py
+++ b/csdr/chain/__init__.py
@@ -1,11 +1,10 @@
 from pycsdr.modules import Buffer
-from pycsdr.api import Flow
 
 import logging
 logger = logging.getLogger(__name__)
 
 
-class Chain(Flow):
+class Chain:
     def __init__(self, *workers):
         self.input = None
         self.output = None
@@ -14,7 +13,7 @@ class Chain(Flow):
             self._connect(self.workers[i - 1], self.workers[i])
 
     def _connect(self, w1, w2):
-        buffer = Buffer()
+        buffer = Buffer(w1.getOutputFormat())
         w1.setOutput(buffer)
         w2.setInput(buffer)
 
@@ -36,9 +35,12 @@ class Chain(Flow):
         self.output = buffer
         self.workers[-1].setOutput(buffer)
 
+    def getOutputFormat(self):
+        return self.workers[-1].getOutputFormat()
+
     def pump(self, write):
         if self.output is None:
-            self.setOutput(Buffer())
+            self.setOutput(Buffer(self.getOutputFormat()))
 
         def copy():
             run = True
diff --git a/csdr/chain/fft.py b/csdr/chain/fft.py
index e709b04..68d0379 100644
--- a/csdr/chain/fft.py
+++ b/csdr/chain/fft.py
@@ -1,5 +1,5 @@
 from csdr.chain import Chain
-from pycsdr.modules import Fft, LogPower, LogAveragePower, FftExchangeSides, CompressFftAdpcm
+from pycsdr.modules import Fft, LogPower, LogAveragePower, FftSwap, FftAdpcm
 
 import logging
 logger = logging.getLogger(__name__)
@@ -37,7 +37,7 @@ class FftAverager(Chain):
                 if self.input is not None:
                     self.worker.setInput(self.input)
             else:
-                self.worker.setFftAverages(avg_number=fft_averages)
+                self.worker.setAvgNumber(avg_number=fft_averages)
         self.workers = [self.worker]
         self.fftAverages = fft_averages
 
@@ -53,7 +53,7 @@ class FftChain(Chain):
 
         self.fft = Fft(size=self.size, every_n_samples=self.blockSize)
         self.averager = FftAverager(fft_size=self.size, fft_averages=10)
-        self.fftExchangeSides = FftExchangeSides(fft_size=self.size)
+        self.fftExchangeSides = FftSwap(fft_size=self.size)
         workers = [
             self.fft,
             self.averager,
@@ -61,7 +61,7 @@ class FftChain(Chain):
         ]
         self.compressFftAdpcm = None
         if fft_compression == "adpcm":
-            self.compressFftAdpcm = CompressFftAdpcm(fft_size=self.size)
+            self.compressFftAdpcm = FftAdpcm(fft_size=self.size)
             workers += [self.compressFftAdpcm]
 
         self._updateParameters()
diff --git a/owrx/source/__init__.py b/owrx/source/__init__.py
index 691867c..ddd4f36 100644
--- a/owrx/source/__init__.py
+++ b/owrx/source/__init__.py
@@ -21,7 +21,8 @@ from owrx.feature import FeatureDetector
 from typing import List
 from enum import Enum
 
-from pycsdr.modules import SocketClient, Buffer
+from pycsdr.modules import TcpSource, Buffer
+from pycsdr.types import Format
 
 import logging
 
@@ -111,7 +112,7 @@ class SdrSource(ABC):
         self.id = id
 
         self.commandMapper = None
-        self.socketClient = None
+        self.tcpSource = None
         self.buffer = None
 
         self.props = PropertyStack()
@@ -248,16 +249,16 @@ class SdrSource(ABC):
     def getPort(self):
         return self.port
 
-    def _getSocketCLient(self):
+    def _getTcpSource(self):
         with self.modificationLock:
-            if self.socketClient is None:
-                self.socketClient = SocketClient(self.port)
-        return self.socketClient
+            if self.tcpSource is None:
+                self.tcpSource = TcpSource(self.port)
+        return self.tcpSource
 
     def getBuffer(self):
         if self.buffer is None:
-            self.buffer = Buffer()
-            self._getSocketCLient().setOutput(self.buffer)
+            self.buffer = Buffer(Format.COMPLEX_FLOAT)
+            self._getTcpSource().setOutput(self.buffer)
         return self.buffer
 
     def getCommandValues(self):
@@ -369,9 +370,9 @@ class SdrSource(ABC):
                     pass
             if self.monitor:
                 self.monitor.join()
-            if self.socketClient is not None:
-                self.socketClient.stop()
-                self.socketClient = None
+            if self.tcpSource is not None:
+                self.tcpSource.stop()
+                self.tcpSource = None
                 self.buffer = None
 
     def shutdown(self):