Hacking a Boss DR-110

[DCMagnuson at aol.com]

Hi Everyone,

Someone just handed me a Boss DR-110 drum machine, and asked me to hack it up 
for them.  I've already located a set of schematics online as well as a 
simple DIN-sync modification.  

Has anyone else chopped one of these up?  I'm looking to add tuning and decay 
pots to many of the sounds, as well as possibly building a stereo mixer with 
panning to control the internal sounds a little better.... 

Also, the DIN-sync mod I found sets the tempo, but doesn't control the 
start/stop function... if anyone has some pointers to make this thing 
start/stop in time, I'd appreciate it.  I imagine it's a relatively easy 
thing to do, but I don't know much about DIN-sync.  What type of signals 
should I expect to see on the start/stop line?   

Thanks in advance everyone,

Dave Magnuson