Hi,
All my oscillators track fine when plugged directly into my Kenton midi to cv converter. I patch in an A-170 to use as a portamento controller, and 1v/oct goes pretty much to hell. With all knobs fully counterclockwise the tracking sucks. Just patching it in causes the pitch to drop about 9 semitones.
I have two A-170's, so the odds of them both being busted is slim, and they work fine in every other application I use them for. The Kenton has portamento, but changing the value is a pain.
So what gives