Index: wave.py
===================================================================
--- wave.py
+++ wave.py
@@ -149,6 +149,8 @@
     """
 
     def initfp(self, file):
+        #  assume PCM initially
+        self._wavformat = WAVE_FORMAT_PCM
         self._convert = None
         self._soundpos = 0
         self._file = Chunk(file, bigendian = 0)
@@ -303,6 +305,9 @@
         self._sampwidth = (sampwidth + 7) // 8
         self._sampformat = self._formattag | (self._sampwidth<<8)
 
+        if self._formattag == WAVE_FORMAT_IEEE_FLOAT:
+            self._wavformat = WAVE_FORMAT_IEEE_FLOAT
+
         if self._formattag == WAVE_FORMAT_IEEE_FLOAT and chunk.getsize() > 16:
             extFmtsize = struct.unpack_from('<H', chunk.read(2))
             if extFmtsize[0] > 0:
@@ -443,7 +448,7 @@
     def setparams(self, params):
         if len(params) == 6:
             nchannels, sampwidth, framerate, nframes, comptype, compname = params
-            wavformat = WAVE_FORMAT_PCM
+            self._wavformat = WAVE_FORMAT_PCM
         elif len(params) == 7:
             nchannels, sampwidth, framerate, nframes, comptype, compname, wavformat = params
         else: