diff --git a/SDFTools/examples/example5/graph.py b/SDFTools/examples/example5/graph.py
index 3a7116f1..a233d32d 100755
--- a/SDFTools/examples/example5/graph.py
+++ b/SDFTools/examples/example5/graph.py
@@ -17,8 +17,8 @@ q15Type = CType(Q15)
 ### Because the MFCC slising window is sliding by half a second
 ### each time (half number of MFCCs)
 src=WavSource("src",NBCHANNELS*AUDIO_INTERRUPT_LENGTH)
-src.addLiteralArg("test_stereo.wav")
 src.addLiteralArg(True)
+src.addLiteralArg("test_stereo.wav")
 
 toMono=StereoToMono("toMono",q15Type,AUDIO_INTERRUPT_LENGTH)
 
diff --git a/SDFTools/examples/example5/sched.py b/SDFTools/examples/example5/sched.py
index 663abc9e..34eb644f 100755
--- a/SDFTools/examples/example5/sched.py
+++ b/SDFTools/examples/example5/sched.py
@@ -60,7 +60,7 @@ def scheduler(mfccConfig,dispbuf):
     mfcc = MFCC(1024,13,fifo2,fifo3,mfccConfig)
     mfccWin = SlidingBuffer(754,377,fifo3,fifo4)
     sink = NumpySink(754,fifo4,dispbuf)
-    src = WavSource(384,fifo0,"test_stereo.wav",True)
+    src = WavSource(384,fifo0,True,"test_stereo.wav")
     toMono = StereoToMono(384,192,fifo0,fifo1)
 
     while((sdfError==0) and (debugCounter > 0)):
diff --git a/SDFTools/sdf/nodes/py/CFFT.py b/SDFTools/sdf/nodes/py/CFFT.py
index 51e647f7..7235a576 100755
--- a/SDFTools/sdf/nodes/py/CFFT.py
+++ b/SDFTools/sdf/nodes/py/CFFT.py
@@ -34,7 +34,7 @@ import cmsisdsp as dsp
 class CFFT(GenericNode):
     def __init__(self,inputSize,outSize,fifoin,fifoout):
         GenericNode.__init__(self,inputSize,outSize,fifoin,fifoout)
-        if fifoin.type == np.dtype(np.float):
+        if fifoin.type == np.dtype(np.float32):
            self._cfft=dsp.arm_cfft_instance_f32()
            status=dsp.arm_cfft_init_f32(self._cfft,inputSize>>1)
         if fifoin.type == np.dtype(np.int16):
@@ -46,7 +46,7 @@ class CFFT(GenericNode):
         b=self.getWriteBuffer()
         # Copy arrays (not just assign references)
         b[:]=a[:]
-        if self._src.type == np.dtype(np.float):
+        if self._src.type == np.dtype(np.float32):
            dsp.arm_cfft_f32(self._cfft,b,0,1)
         if self._src.type == np.dtype(np.int16):
            dsp.arm_cfft_q15(self._cfft,b,0,1)
diff --git a/SDFTools/sdf/nodes/py/ICFFT.py b/SDFTools/sdf/nodes/py/ICFFT.py
index 67e79e72..31d2b61a 100755
--- a/SDFTools/sdf/nodes/py/ICFFT.py
+++ b/SDFTools/sdf/nodes/py/ICFFT.py
@@ -32,7 +32,7 @@ import cmsisdsp as dsp
 class ICFFT(GenericNode):
     def __init__(self,inputSize,outSize,fifoin,fifoout):
         GenericNode.__init__(self,inputSize,outSize,fifoin,fifoout)
-        if fifoin.type == np.dtype(np.float):
+        if fifoin.type == np.dtype(np.float32):
            self._icfft=dsp.arm_cfft_instance_f32()
            status=dsp.arm_cfft_init_f32(self._icfft,inputSize>>1)
         if fifoin.type == np.dtype(np.int16):
@@ -44,7 +44,7 @@ class ICFFT(GenericNode):
         b=self.getWriteBuffer()
         # Copy arrays (not just assign references)
         b[:]=a[:]
-        if self._src.type == np.dtype(np.float):
+        if self._src.type == np.dtype(np.float32):
            dsp.arm_cfft_f32(self._icfft,b,1,1)
         if self._src.type == np.dtype(np.int16):
            dsp.arm_cfft_q15(self._icfft,b,1,1)
diff --git a/SDFTools/sdf/nodes/py/MFCC.py b/SDFTools/sdf/nodes/py/MFCC.py
index 5960b3e5..4845e52d 100755
--- a/SDFTools/sdf/nodes/py/MFCC.py
+++ b/SDFTools/sdf/nodes/py/MFCC.py
@@ -35,13 +35,16 @@ class MFCC(GenericNode):
     def __init__(self,inputSize,outSize,fifoin,fifoout,mfccConfig):
         GenericNode.__init__(self,inputSize,outSize,fifoin,fifoout)
         self._config=mfccConfig
-        self._tmp=np.zeros(2*inputSize,dtype=np.int32)
+        if self._src.type == np.dtype(np.float32):
+           self._tmp=np.zeros(2*inputSize,dtype=np.float32)
+        else:
+           self._tmp=np.zeros(2*inputSize,dtype=np.int32)
 
 
     def run(self):
         a=self.getReadBuffer()
         b=self.getWriteBuffer()
-        if self._src.type == np.dtype(np.float):
+        if self._src.type == np.dtype(np.float32):
            res=dsp.arm_mfcc_f32(self._config,a,self._tmp)
            errorStatus = 0
         if self._src.type == np.dtype(np.int32):
diff --git a/SDFTools/sdf/nodes/py/StereoToMono.py b/SDFTools/sdf/nodes/py/StereoToMono.py
index 4fff561f..a34d0339 100755
--- a/SDFTools/sdf/nodes/py/StereoToMono.py
+++ b/SDFTools/sdf/nodes/py/StereoToMono.py
@@ -32,7 +32,7 @@ import cmsisdsp as dsp
 class StereoToMono(GenericNode):
     def __init__(self,inputSize,outputSize,fifoin,fifoout):
         GenericNode.__init__(self,inputSize,outputSize,fifoin,fifoout)
-        if fifoin.type == np.dtype(np.float):
+        if fifoin.type == np.dtype(np.float32):
             self._isFloat=True 
         else:
             self._isFloat=False
diff --git a/SDFTools/sdf/nodes/py/host/WavSource.py b/SDFTools/sdf/nodes/py/host/WavSource.py
index 11fe1e0b..7f9aef3c 100755
--- a/SDFTools/sdf/nodes/py/host/WavSource.py
+++ b/SDFTools/sdf/nodes/py/host/WavSource.py
@@ -33,7 +33,7 @@ import wave
 # Pad with zero when end of file is reached
 class WavSource(GenericSource):
     "Read a stereo wav with 16 bits encoding"
-    def __init__(self,outputSize,fifoout,name,stereo=True):
+    def __init__(self,outputSize,fifoout,stereo,name):
         GenericSource.__init__(self,outputSize,fifoout)
         self._file=wave.open(name, 'rb')
         self._stereo=stereo
diff --git a/SDFTools/sdf/schedule/node.py b/SDFTools/sdf/schedule/node.py
index fd6a5031..29fb54dc 100755
--- a/SDFTools/sdf/schedule/node.py
+++ b/SDFTools/sdf/schedule/node.py
@@ -130,7 +130,32 @@ class Constant:
         return True
     
     
+class SchedArg:
+    """Class for arguments of the scheduler functions.
+       They can either be a literal arg like string, boolean
+       or number or they can be a variable name"""
+    
+    def __init__(self,name):
+          self._name=name 
+
+class ArgLiteral(SchedArg):
+     def __init__(self,name):
+        super().__init__(name)
+
+     @property
+     def arg(self):
+        if isinstance(self._name,str):
+             return("\"%s\"" % self._name) 
+        else:
+             return(str(self._name))
+
+class VarLiteral(SchedArg):
+     def __init__(self,name):
+        super().__init__(name)
 
+     @property 
+     def arg(self):
+        return(self._name)
 
 class BaseNode:
     """Root class for all Nodes of a dataflow graph.
@@ -149,8 +174,7 @@ class BaseNode:
         # The fifo args
         self._args=""
         # Literal arguments
-        self.literalArgs=None 
-        self.variableArguments=None
+        self.schedArgs=None 
 
     def __getattr__(self,name):
         """Present inputs / outputs as attributes"""
@@ -169,16 +193,16 @@ class BaseNode:
         raise IndexError 
 
     def addLiteralArg(self,l):
-        if self.literalArgs:
-            self.literalArgs.append(l)
+        if self.schedArgs:
+            self.schedArgs.append(ArgLiteral(l))
         else:
-            self.literalArgs=[l]
+            self.schedArgs=[ArgLiteral(l)]
 
     def addVariableArg(self,l):
-        if self.variableArguments:
-            self.variableArguments.append(l)
+        if self.schedArgs:
+            self.schedArgs.append(VarLiteral(l))
         else:
-            self.variableArguments=[l]
+            self.schedArgs=[VarLiteral(l)]
 
     @property
     def isConstantNode(self):
@@ -291,14 +315,9 @@ class BaseNode:
         """String of fifo args for object initialization
             with literal argument and variable arguments"""
         allArgs=self.listOfargs
-        if self.literalArgs:
-            for lit in self.literalArgs:
-                if isinstance(lit,str):
-                    allArgs.append("\"%s\"" % lit) 
-                else:
-                    allArgs.append(str(lit))
-        if self.variableArguments:
-            allArgs += self.variableArguments
+        if self.schedArgs:
+            for lit in self.schedArgs:
+                allArgs.append(lit.arg)
         return "".join(joinit(allArgs,","))
     
     @args.setter