Hello,
I have made a little visualization of the amplitude of the partials used to produce Risset 's Bell (based on a patch of Puckette about additive synthesis : http://msp.ucsd.edu/techniques/v0.11/book-html/node71.html ).
The graphic is made with Processing ; OSC is used to export data.
sound is here : http://m.larri.eu/RissetsBell_f369.wav