Pretty cool story!

As for your question, I have a friend who has this Roland module with the Mellotron samples

He just uses it with a regular board with midi THRU

If thats the type of module you have , then a RadioShack casio with midi can do the job

and for the TRONS' sake here is a site you might aldready know but i'll post it anyway
http://www.tronsounds.com/

cheers