You probably have an old version installed. Any version earlier than 0.1-5 will not be shown in the application menu. Could you try to remove the package via App manage and install it again? If it doesn't work, try to install it via x-terminal using sudo gainroot and dpkg -i [package-name].

After installation, check if the binary is installed by:
ls /usr/bin/symfonie

If you don't see anything, something is wrong. Please report it back

Added:
If you see /usr/bin/symfonie, you can you execute it from your terminal, which will launch the program.