Interface to a dynamic lib which loads other dynamic libs

Hallo!

I try to use a dynamic library (slv2) in python, which is actually a 
host for plugins (lv2 audio plugins, http://lv2plug.in/).
That means slv2 loads other dynamic libraries (= plugins) at runtime and 
I want to be able to call functions from those plugins.

The basic interface to slv2 works as it should, but as soon as I want to 
instanciate some plugins, I get the following problem with ctypes:

   AttributeError: /usr/lib/libslv2.so.9: undefined symbol: 
slv2_instance_activate

because the symbol slv2_instance_activate is not in the slv2 library.

I also tried to additionally load the plugin with ctypes:
   ctypes.CDLL("/usr/lib/lv2/mypluginname.so", mode=ctypes.RTLD_GLOBAL)
but that also did not work.

So my question:
Is it possible to interface such complicated libraries with ctypes ? (or 
should I use something else)
How should this be done ?

Thanks for any hints,
LG
Georg

PS: I am on ubuntu linux, python version 2.6.5


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