Just a quick thought about filter frequency modulation and tracking.
Since I've removed tracking-tuning and do CV lookup instead to get good filter CV tracking, FM may be an issue. 1V of exponential FM may not be 1 octave up anymore.
However, I assume that the tracking across octaves will be pretty much stable, at least within the middle ranges. If for example +1V increases the pitch by 0.8 octaves (instead of the correct 1 octave), -1V should reduce the pitch by 0.8 octaves. This means that tracking correction can be done in the FM VCA. Also, this means tracking VCA should have a range > 0-5V.
As for linear FM, that changes the exponential converter's reference voltage and that is unaffected by the tracking pot anyway, so no issue there.
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