Analogue systems

I am learning and enjoying my new French Connection Keyboard.... #29 
in the production series.

I am new to synth and need some help on modules.   The original Ondes 
had resonating speakers...

One called PALM that had something like 16 strings that resonated... 
then an electronic version that had springs used for reverberation 
when the instrument was used in large concert halls where 
amplification was needed for the resonating string effect.  Then 
there was the gong... 

"metal replaced the membrane of a loudspeaker causing metal sound 
halation".   The speaker looks like a gong.  Another text says a 
screw connections from the speaker to the gong.

Any ideas as to how to achieve these effects using modules?  I will 
post sound samples of the originals if desired.

pictures:

http://www.chez.com/cslevine/ondes/Ondes_2.htm

Thanks

Bryan
Seattle