libxtract VAMP plugin
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32 bit linux package of the libxtract vamp plugins in .deb format:
https://launchpad.net/~kxstudio-team/+archive/ubuntu/plugins/+build/4275432/+files/vamp-libxtract-plugins_0.4.5-0ubuntu1%7Eraring2_i386.deb

Compiling last version of libxtract vamp plugin from source code:
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Download

* LibXtract 0.6.0 library source code 
> svn checkout svn://svn.code.sf.net/p/libxtract/code/trunk libxtract-code
NOTE: Don't use the version of LibXtract on GitHub (https://github.com/jamiebullock/LibXtract).
The VAMP plugin won't compile against it.
 
* libxtract vamp plugin source code:
https://code.soundsoftware.ac.uk/attachments/download/618/vamp-libxtract-plugins-0.6.6.20121204.tar.gz

* VAMP SDK:
http://code.soundsoftware.ac.uk/attachments/download/690/vamp-plugin-sdk-2.5.tar.gz

Precompiled VAMP libraries for linux 32 bit (you may try to use this instead of compiling de VAMP SDK):
http://code.soundsoftware.ac.uk/attachments/download/704/vamp-plugin-sdk-2.5-binaries-i686-linux.tar.gz

Other packages: http://vamp-plugins.org/develop.html
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You need 'autotools' from your distro repositories:
automake >= 1.11
autoconf >= 2.68
libtool >= 2.4

Also you need the following packages from your repositories installed in your linux distro:
'libsndfile', 'libsndfile-dev', 'libfftw3-3', 'libfftw3-dev', and 'subversion' (svn)

IF you don't have a libfftw3 package, you must compile it from
* FFTW3 (The Fastest Fourier Transform in the West 3.3.4)
http://www.fftw.org/fftw-3.3.4.tar.gz

Uncompress all packages at the same location, you will get more or less the following folders

- vamp-plugin-sdk-2.5 folder.
- vamp-libxtract-plugins-0.6.6.20121204
- libxtract-code
- fftw-3.3.4.tar.gz (if compiling from source code)

> cd fftw-3.3.4
> ./configure --enable-float
> make
> sudo make install

> cd libxtract-code
> ./autogen.sh
> ./configure --enable-fft --enable-simpletest
> make
> sudo make install

> cd vamp-plugin-sdk-2.5
> ./configure 
> make
> sudo make install

> cd vamp-libxtract-plugins-0.6.6.20121204
> make

To verify whether the plugin library file is 32-bit:
> objdump -f vamp-libxtract.so
>vamp-libxtract-plugins-0.6.6.20121204/vamp-libxtract.so:     file format > elf32-i386
>architecture: i386, flags 0x00000150:

Now copy the plugin files generated at vamp-libxtract-plugins-0.6.6.20121204: vamp-libxtract.so, vamp-libxtract.n3, and vamp-libxtract.cat to your VAMP system (or personal) plugin folder. Restart Sonic Visualizer.
The libxtract plugin features should show up in the Transform menu. 

Go to Transform -> Find a Transform... and type 'slope'. The 'Spectral Slope' feature from the libxtract plugin should be available.

That's it!!

Let me know about any issues at pierre@dlsi.ua.es