@richtrix:
This is close to the method I use (explained in this thread) But I experience that V/oct. linearity could not be accheived over the whole range of the keyboard (or even the extended reange including HI and LOW transposition). When "offset" and "slope" on the voiceboard are set such that  a "jump" from C0 (lowest C) to C5 (highest C) on the keyboard appears correct on the chromatic tuner, it might not be correct for octave jumps in the range of C2 and C4. Please consider to concentrate your tuning efforts to that keyrange you are intending to use most.

Please share your tuning experience with me.