Korg Poly800/EX800 Users

Dear all electronic experts,

I would like to add knobs for chorus features on my 800mk1.
(lfo speed, feedback, mix/dry)

I've found lots of postings about this but unfortunately I don't know 
what to do if there's something about comparators, bbd, signals, .....

I can only locate components on the boards, solder and build in knobs.

So please, could you repeat your hints for chorus mods so that idiots 
like me can understand? I don't want to damage my synth by try-and-
error, so I hope you can help me....

Thanks a lot in advance,


Olaf