'midi in" project....

wow, for a bare bones midi2cv is half bad! To reduce the glide or portamento between notes I replaced the 470uf cap in the rc filter with a 47 and 22uf. It was the lowest I could go without audibly impacting the cv out. The only bugs/problems Ive encountered are: Occasionally I will get a stuck note and when two keys are pressed it cancels the "note on" command. Anyone else experiencing this?
I have a r2r dac that I have been trying to use, with no luck. Its a AD7528 , from this pic based midi to cv I tried to make:, http://www.emusic-diy.org/Schematics/Misc/MidiCv?action=AttachFile&do=get&target=MIDITOCV.GIF and Schematics/Misc/MidiCv - E-Music DIY
even though the pic loaded properly, I could never get it working, even the gate. ?anyway...) I also have some dac0800's
Im still not sure how to change the code of the midi2cv to accommodate a dac or resistor bridge. The pin configs and labeling of the different dacs already posted about seem to vary so much that I cant seem to figure much out by looking at other examples. any thought or does anyone know of a real simple interfacing tutorial?