I had a similar problem when using the Moog FreqBox as a second oscillator expander. It wouldn't play in tune when cv-ed to the Minibrute and it was pitched higher by an octave even at the lowest frequency setting on the FB vco. Luckily I also have a Moog CP-251 which features a cv mixer with offset and two attenuators. The offset is the most important and I can now tune the MB keyboard cv pitch output over several octaves now. It's also proving useful when interfacing with my Lil Phatty - it too is pitched an octave off.
I know they're pricey - but it would be a definite solution and it's very useful tool too. Apart from the four way mixer (with + and - outputs. hello reverse keyboard scaling!) and attenuators, there's a cv controllable LFO, extra noise source, lag generator, four way multiple and sample & hold.
“I have stretched ropes from steeple to steeple; garlands from window to window; golden chains from star to star, and I dance.” - Rimbaud