Well, I usually start Sonic-Visualiser from the command-line since the Gnome Metacity interface creates no icon for it on my desktop. However, since it starts so fast on this machine the notices in the shell go by blindingly fast. BUT.. I should have paid attention.
Failed to load library /usr/lib/vamp/MzPitchPower.so: libstdc++.so.5:
That was the crucial error message. sudo wagig status llibstdc++5 states N/A meanign its not there. I downloaded the package and installed it and the Mazurka Plugin now works.
I was started to wonder why dpkg didn't alert me to the problem, however I remembered that although the main program was installed using dpkg, most of the Plugins were not. I simply dropped them into the correct place in the system.
Now back to the tutorial to discover how to use these new plugins