Calibrated V/Oct response adds one usefull application: Transposing the
shift oscillator in parallel with the VCOs (or whatever input sound). So
you can get the same (harmonic or non-harmonic) partials over the whole
keyboard range
I would think this would be a very important part of a FS (if there is not an external input which would defeat the internal oscillator). I know that Mr. T. and I (as well as many others) on this list have had several discussions about the need for modules to generate complex non harmonic overtones for this very purpose.
JB