200e

Just noticed when I edited a sentence I am unclear on in the post I just sent I left it even 
more unclear. 

The Buchla is going to send out a 10v trigger pulse combined with a 5v gate length signal. 
My gut feeling is since the synthi is only expecting 5v and since it's not even a standard 
generic interface connection (you've tapped into the Cinch Jones keyboard connector), I'd 
definitely be  cautious giving the synthi a hot trigger like that. I'd probably send it through an 
external  comparator if I didn't have a better answer.