µtune has a 10point VCO calibration. This could be used to create 1.2V/Oct easily. Just set the 10 points to multiples of 1.2V, eg: 1.2 , 2.4, 3.6, …
So not possible for each inividual note, but this should get you close to ideal.
For oscillators that have a linear V/Hz response, there is also a dedicated V/hz mode.