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