[sdiy] VCO autotune for poly analog modular

[mrmike]

Yes, I'm insane.
I'm trying to build a polyphonic analog modular based on five ASM-1s. 
Think Obie 4 voice, rather than Prophet-5, as a design style.  I would, 
however, like to be able to set an accurate single voice across all five 
modules. Basically, all five panels could have their own controls, but a 
switch on panel one will disable the front panel controls  on panels 2-5 
and slave them to the controls on panel one.  In this mode,  an autotune 
function would be useful.  Has anyone ever implemented one of these in a 
DIY polysynth?

I was thinking of having the tune function compare VCO freq at a given 
CV voltage at several points across the 0-5V range for each VCO, then 
create a lookup table with a compensation map for each VCO.  As each CV 
for each voice comes in, its corresponding spot in the table is found 
and the tuning offset voltage is added to the initial CV and then sent 
to the VCO. Is this a dopey idea?

Thoughts welcome!

mrmike