Python package for signal processing

I am looking for a Python package to perform an efficient Constant Q Transform (ie using an FFT to speed up the process). I found a toolbox named CQ-NSGT/sliCQ Toolbox, but I get the following error: ``` File "build\bdist.win32\egg\nsgt\__init__.py", line 37, in <module> File "build\bdist.win32\egg\nsgt\audio.py", line 7, in <module> File "C:\Python27\lib\site-packages\scikits\audiolab\__init__.py", line 25, in <module> from pysndfile import formatinfo, sndfile File "C:\Python27\lib\site-packages\scikits\audiolab\pysndfile\__init__.py", line 1, in <module> from _sndfile import Sndfile, Format, available_file_formats, \ File "numpy.pxd", line 30, in scikits.audiolab.pysndfile._sndfile (scikits\audiolab\pysndfile\_sndfile.c:9632) ValueError: numpy.dtype does not appear to be the correct type object ``` There seems to be a problem either with Numpy (which I doubt) or more likely with scikit audiolab. Do you know where the problem comes from?