Vintage Simmons Drums (UK) Users Group

I know this is a long shot but are there any other users of the 
Cheetah MD16 drum machine
on this user group? I am having major midi problems with 
mine. I've replaced the leaking battery but midi still doesn't
work. Also, bought another second hand unit but getting the
same problem with this unit also!! Would anyone have any tips?

Thanks
Andy