Tunnage reads tunings from .tun files and translates standard 1v/oct CV (1 octave for each volt divided into 12 parts representing each note of that octave) to 1v/oct CV representing the specified tuning. Both single and polyphonic input/output are supported. From detuning one note to eschewing A440 and using A432 (or A441 or ...) to using your favorite microtonal tuning, if you can specify it Tunnage can translate it.
All three versions of the tuning specification are supported, from defining each note to algorithmic tuning. A file containing various examples based on the spec gives you an indication of the different ways to specify tunings.