ah, okay... I understand your point very well.
there's a programmer from CHD which provides clock and MIDI and can be connected via cables into the existing jacks on the CR, so you don't have to modify your machine in any way.http://www.chd-el.cz/index.php?id=435&lngid=en
but this could be a bit expensive.
maybe you can get a used one on ebay?
electronics consists to 80% of superstition and to 20% of fairy tales • DIY or die!