Vintage Synth Repair

Hey all.

I just recently purchased a Moog Source, and am having plenty of fun 
with it.

I was wondering if anyone out there knows how to mod the source so you 
can clock the arpeggiator (Which is real clever) off an external clock 
etc..

I found the Encore website, and they sell midi mods for it, which does 
allow the arpeggiator to clock to midi, but I want something a touch 
more simple than that..

Any help would be much appreciated.

Regards

Mike