I one terminal I did:

# ulimit -c unlimited
# ghostess -debug -1 /usr/lib/dssi/sineshaper.so

ghostess: ghostess starting...
ghostess: debug level now ffffffff
ghostess: instance  0 on channel  0, plugin  0 is 'sineshaper/ll-sineshaper/inst00'
ghostess: host OSC URL is osc.udp://Musix_GNU+Linux:11425/
ghostess sineshaper/ll-sineshaper/inst00: program 8 is MIDI bank 0 program 8, named 'Nasty'
ghostess sineshaper/ll-sineshaper/inst00: program 7 is MIDI bank 0 program 7, named 'Cosineshaper'
ghostess sineshaper/ll-sineshaper/inst00: program 6 is MIDI bank 0 program 6, named 'Noisy'
ghostess sineshaper/ll-sineshaper/inst00: program 5 is MIDI bank 0 program 5, named 'Clean'
ghostess sineshaper/ll-sineshaper/inst00: program 4 is MIDI bank 0 program 4, named 'Soft'
ghostess sineshaper/ll-sineshaper/inst00: program 3 is MIDI bank 0 program 3, named 'Bright'
ghostess sineshaper/ll-sineshaper/inst00: program 2 is MIDI bank 0 program 2, named 'Woodpecker'
ghostess sineshaper/ll-sineshaper/inst00: program 1 is MIDI bank 0 program 1, named 'Tremolo pad'
ghostess sineshaper/ll-sineshaper/inst00: program 0 is MIDI bank 0 program 0, named 'Default'
ghostess ready


In another terminal:

/usr/lib/dssi/sineshaper/sineshaper_gtk osc.udp://Musix_GNU+Linux:17067/dssi/sineshaper/ll-sineshaper/inst00 sineshaper.so sineshaper Testing

But now I didn't got any error! (segmentation fault), and the GUI is still not working... I am lost...