Here's something interesting: I did end up sucessfully controlling the Nuvo tuner, by using nothing more than a narrower gauge wire (and much shorter) than I was originally using. This was completely unintentional, as I couldn't imagine it should make THAT big a difference, but it sure did. All 3 mini-to-mini cables that I tried tested out fine, but just the 6 incher worked. Bizarre!

RobZ